Answer:
1. Index
2. isotopes
3. epoch
4. An index fossil is known from a specific time period, is prevalent, and has had many fossils formed. This allows for recognition of similar time periods in different geographic locations.
5. The geologic time periods from smallest to largest are epoch, period, era, and eon. This organization is important because it allows us to describe and classify the evolution of living things on Earth.
6. Human beings evolved during the Cenozoic era.
7. The oldest fossils are estimated to be 3.5 billion years old.
8. Relative dating compares the ages of fossils and rocks relative to one another in a specific area to determine which are older and which are younger. Absolute dating applies a specific time period or age to the fossils and rocks.
Explanation:
Penn Foster
Index fossils are of organisms known to have existed during a certain time period and are relatively abundant, assisting scientists in dating rocks and fossils within them. Absolute dating of fossils and rocks takes advantage of radioactive isotopes within the fossils or rocks and their decay. We are living during the Cenozoic era and the Holocene epoch.
⇒Importance of index fossil:
An index fossil is known from a specific time period, is prevalent, and has had many fossils formed. This allows for recognition of similar time periods in different geographic locations.⇒Order of geological time period:
The geologic time periods from smallest to largest are epoch, period, era, and eon. This organization is important because it allows us to describe and classify the evolution of living things on Earth.⇒Human beings evolved during the Cenozoic era.
⇒The oldest fossils are estimated to be 3.5 billion years old.
⇒Difference between relative and absolute dating:
Relative dating compares the ages of fossils and rocks relative to one another in a specific area to determine which are older and which are younger. Absolute dating applies a specific time period or age to the fossils and rocks.Learn more:
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how a 300-N force can combine with a 100-N force on sled
Answer:
If a 300-N force pushes you forward on a sled, and a 100-N force pushes you back (i.e. the wind), the resultant net force is still 200-N forward
Explanation:
Carbon dioxide goes from a solid to a gas without becoming a liquid. This is a chemical change.
True
False
Answer:
I think its true
Explanation:
hope this helps
What idea did Hardy and Weinberg disprove?
A. There are seven conditions for equilibrium.
B. Dominant alleles become more common in each generation.
C. The gene pool for a population frequently changes.
D. Allele frequency is stable between generations.
B: Dominant alleles become more common in each generation
According to Hardy-Weinberg the allelic frequencies remain the same through generations. Option is B. dominant alleles become more common in each generation.
What are the Hardy-Weinberg theory?The Hardy-Weinberg equilibrium is a theory that states that when a population is in equilibrium, its allelic and genotypic frequencies remain the same through generations.
No evolutive forces are acting on these populations (natural selection, genetic flow, genetic drift, mutation), there are random matings, no superposed generations, and the population size is infinite.
The correct option is B. They disproved that dominant alleles become more common in each generation.
This can not be true since allelic frequencies remain the same through generations.
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Which mineral is used in making cans and is found mainly in Australia?
hematite
bauxite
tektite
magnetite
Answer:
bauxite
Explanation:
I just took the test!
SEEEE ATTACHHHHHMEEENNTTTTSS!!!!!
Explanation:
For question no 19
Force (F) = 20N
distance (d) = 5m
Work = F * d
= 20 * 5
= 100 J
Now
For question no 20
D. No matter how much force is applied the object must have motion for work to be done.
Answer:
The 19 is A and the 20 is D
Explanation:
Work done is N *m
So it gonna be 20N*5m
Giving 100J
The 20 work is only done when the object sets into motion
Which list contains only abiotic conditions that might be found in a pond ecosystem? *
1 point
Temperature of the water, green plant populations, dissolved minerals in the water
Temperature of the water, dissolved oxygen in the water, dissolved minerals in the water
Bacteria, dissolved minerals in the water, temperature of the water
Dissolved oxygen in the water, fish populations, insect populations
Answer:
Temperature of the water, dissolved oxygen in the water, dissolved minerals in the waterExplanation:
Abiotic conditions strictly comprises on non-living elements. In the first statement, green plant population is mentioned which is a biotic factor.
In the 3rd statement, bacteria are listed which are biotic entities. Their presence suggest the involvement of biogeochemical cycles in the lake, thus, highlighting both biotic and non-biotic conditions.
In the 4th statement, fish and insect population is mentioned which are also biological entities.
Only second statement is correct because it essentially talks about the abiotic conditions such as temperature, dissolved oxygen and dissolved minerals. Although these parameters could affect the life inside the pond (which cannot be exculded in reality); nevertheless, the need of statement is to identify only those parameters which are abiotic.
Which statement best exemplifies the biodiversity of an ecosystem?
A small pond has about 1,300 organisms and 26 different species living in it.
A small forest supports a population of 35 elephants.
A desert receives some rainfall, which supports several species of plants.
A pond is home to animals that are able to live in the polluted water.
A small pond has about 1,300 organisms and 26 different species living in it best exemplifies biodiversity of an ecosystem
Explanation:
Biodiversity simply defines the number of variety along with variability of organisms in an ecosystem.
Biodiversity is the result of diversity among different species and within a species. Hence, a small pond with 1300 organisms belonging to 26 different species exemplifies biodiversity best.
Although the pond may be small, it may support optimal living conditions for various types of organisms to grow and multiply in number and to live together in the aquatic ecosystem.
The statement 'A small pond has about 1,300 organisms and 26 different species living in it' best exemplifies biodiversity, as it indicates high species richness and population size.
Explanation:In the context of biology, biodiversity refers to the variety of life in a particular habitat or ecosystem. It can be measured by the number of different species present and their population sizes. Among the options presented, 'A small pond has about 1,300 organisms and 26 different species living in it' is the option that best exemplifies the biodiversity of an ecosystem. This is because it gives us an indication of a high species richness (26 different species), and a large total population size (1,300 organisms), leading to a high biodiversity. The other options do not provide enough information about the variety of species and their individual populations.
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The image shows Isotherms on a map.
What temperature pattern do the isotherms show?
A. lemperatures increase from south to north.
B. There is a zone of low temperatures in the Southwest.
C. There is a zone of high temperatures in the center of the country.
D. Temperatures increase from the center of the country toward the Southwest.
Answer:
According to the information on the map, the temperature pattern showing the isotherms is temperatures increase from the center of the country toward the Southwest (option D).
Explanation:
Isotherms are lines drawn on a map to show areas that -according to their geographical characteristics- have the same temperature level. with the same temperature levels.
On the map presented, an increase in temperature from north to south can be clearly seen, with the temperature in the centre (20°) showing a pattern of increase towards the southwest (30, 40 and 50°).
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Answer:
According to the information on the map, the temperature pattern showing the isotherms is temperatures increase from the center of the country toward the Southwest (option D).
Explanation:
Explanation: Isotherms are lines drawn on a map to show areas that -according to their geographical characteristics- have the same temperature level. with the same temperature levels.
Select all of the statements that are examples of technology in science.
chemists using a computer program to analyze data from their experiments
physicists using a water tank to observe the way waves interact with a model vehicle
biologists writing down observations of animal behavior
physicists discussing the results of an experiment
geologists using a seismograph to record vibrations moving through the Earth
Answer:
A, B, E
Explanation:
Answer:
First, second, and the last one
Explanation:
I took the teat and got it right :)
How did scientists determine SM0313 is the oldest star ever discovered?
Answer:
The star sm0313, was discovered using the ANU skymapper telescope at the siding spring observatory and later confirmed by the megellan telescope in Chile. Somewhat surprisingly, it's located a "mere" 6,000 thousand light-years away, they origins date back to the beginning of time.
Answer:
-It was discovered using the ANU skymapper telescope. Scientists found that it is a good 6,000 lightyears away, dating back to the beginning of time.
Explanation:
in order to replicate itself, a virus must first do what
A tree that can be found in the mountains and produces seeds in cones is a type of.......
Answer:
Connifer
Explanation:
What is some of the evidence for speed at which glaciers are melting
Answer:
The main evidence of glaciers melting is the melting of Alaska's Muir glaciers.
Explanation:
The main reason of melting of glaciers is the increase in temperature due to more emissions of greenhouse gases such as carbondioxide and methane gases. These greenhouse gases trap reflected solar radiation which increases the atmospheric temperature cause global warming. This global warming is responsible for the increase in sea level due to glaciers melting.
How does natural selection work regarding individuals and populations regarding which will be most successful?
Answer:
Natural selection doesn't really choose what animal/species is going to survive it's all based on the environment they live in. While a blue bird does well in the jungle it may not do well in the desert. For individuals it's based on their genes and genetics. Some are more prone to have a trail that doesn't benefit them and in fact, harms them in their environment. For populations you will see lots of the same animals but with different traits so some may do better in the wild than others because of those traits. A population is more likely to be successful because you do better when working with others. So animals have a better chance to survive if there is more diversity.
Which of these may be a matter of serious concern for an ENVIRONMENTALIST?
1.increase in tigers which is a threat to herbivourous animals
2.involment of more tribal people in the conservation than proffesionals
3.commercial extraction of timber and other forest produce to meet urban demands
4.exploitation of migrated labourers by contractors in a construction site
Answer:
the answer is #3
Explanation:
Nitrogen: A element only found solely in storage sites of plants and soil
Check all the statements that are true in regards to the carbon cycle*
10 points
Photosynthesis is the process that releases oxygen into the atmosphere
O
Carbon dioxide is taken in as a reactant throughout the process of cellular respiration
The ocean, living things, rocks and soil all act as reservoirs for carbon
Only animals go through the process of respiration
O
Gas, oil and coal are fossil fuels that are primarily composed of carbon
Answer:
Photosynthesis is a process that releases for oxygen into the atmosphere.
The ocean, living things, rocks and soil are all reservoir of carbon.
Gas, oil and coal are fossil fuels that are primarily composed of carbon.
Explanation:
Carbon cycle is a biogeochemical cycle in which carbon compounds are converted and released in the environment. It involved processes where carbondioxide is used with water and light energy in the process of photosynthesis to produce food and release oxygen to the atmosphere. It also involve the process of respiration where carbondioxide is released to the atmosphere after taking in oxygen. It is also involve a process that release carbon when burning of fossil fuels and decay of dead organisms.
Carbo is considered the major composition of living organisms sand it's also the components of biological molecules.
Antarctica can be classified as arid as well as polar. Explain.
Antarctica is both arid and polar because it receives very little precipitation, averaging less than 10 inches per year, which qualifies it as a desert despite being ice-covered. Dry conditions are caused by high-pressure polar highs and air circulation influenced by the Coriolis effect. The interior of the continent, as well as other polar regions, can be classified as high-latitude deserts due to extremely low temperatures and distance from moisture sources.
Antarctica can be classified as both arid and polar due to its climate conditions. While often being synonymous with ice and snow, Antarctica meets the criteria for a desert because it receives extremely low annual precipitation, averaging fewer than 10 inches a year. The majority of this precipitation falls as snow, with coastal regions receiving more snowfall, up to four feet annually, while in the interior near the South Pole, it may only be a few inches.
The reasons behind the aridity include the presence of two high-pressure systems, or polar highs, leading to very dry conditions. Cold sinking air is incapable of holding much moisture, which is exacerbated by the region's distance from moisture sources and the Coriolis effect that influences the polar easterlies' air circulation pattern. Furthermore, despite its ice cover, Antarctica is earth's driest continent because water present near the surface is frozen most of the year.
Understanding the classification of deserts and recognizing that not all deserts are hot and sandy, but in fact may be cold and icy, as in the high-latitude polar deserts, is key. The unique conditions in Antarctica, including its extensive ice shelves and occasional volcanic activity, combined with the political and environmental considerations, all contribute to the complex nature of this continent.
A mutation near the middle of a gene changes the DNA to the following nucleotides: ATT. What
kind of mutation occurred in this situation?
A) missense mutation
B) nonsense mutation
C) silent mutation
D) none of these
Answer:
A mutation near the middle of a gene changes the DNA to the following nucleotides: ATT. What kind of mutation occurred in this situation?
missense mutation
Explanation:
The leaves and petals of dicots are found in multiples of____ or____.
A.four; five
B.five; six
Answer:
a
Explanation:
usatestprep
Describe what scientists mean when they refer to an ecological community such as that shared by the leopards and lions.
Answer:
An ecological community can be described as all the different species of organisms i.e all the different plants and animals, living in a particular habitat at a specified time.
An ecological community will consist of:
Predators: Organisms which feed on other organisms.
Preys: The organisms eaten by predators.
Competitors: Different organisms feeding on the same prey and hence, competing for it. For example the leopards and the lions in a community.
An ecological community refers to interacting populations of different species in a specific habitat. Ecologists study these communities to understand species interactions and competition for resources. Factors like habitat conditions and available species determine which organisms can exist within a particular community.
Explanation:When scientists refer to an ecological community, they are describing a group of interacting populations of different species occupying a given habitat. For instance, the lion and leopard populations living within the same geographic region. The concept of an ecological community also entails the diversity of these species in terms of their number and relative abundance.
Ecologists study these communities to understand how these species interact with each other and compete for the same resources. These species interactions, include predation, herbivory, competition, and pollination, can regulate population sizes and affect other ecological processes impacting diversity.
Within this framework, numerous factors influence the make-up and dynamics of a community, such as the habitat's latitude, rainfall, topography, and the range of species available. These variables are crucial as they determine which organisms can thrive within a particular area.
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Charlie lifts a box with a force of 500 N and sets it on a table top 1.2 m above its starting position. Lauren pushes an identical box up a 5 m ramp from the floor to the top of the same table. Which person did more work? Please explain.
Answer:
Explanation:
Workdone is the force applied to move a body in a specified direction.
Work done = Force x distance
For first box;
Work done = 500 x 1.2 = 600J
For the second box = 500 x 5 = 2500J
Lauren did more work compared to Charlie because he move the box through a larger height which is the distance in this scenario.
Final answer:
Charlie and Lauren both elevate boxes to the same height, but assuming no friction and only addressing vertical displacement, Charlie does 600 J of work, while Lauren would do more due to the 5 m displacement along the ramp, resulting in 2500 J if the full force is applied over the entire distance.
Explanation:
The student is asking about the concept of work in physics, which is calculated as the product of force and displacement in the direction of the force. In this scenario, both Charlie and Lauren are performing work to elevate boxes to the same height, but the question is which person did more work. The key concept is that work is force times the displacement in the direction of the force. So, for Charlie, who lifts the box directly upward for a displacement of 1.2 m with a force of 500 N, the work done can be calculated by the formula:
W = F × d = 500 N × 1.2 m = 600 J (joules)
Lauren's situation is slightly more complex because she is pushing the box up a ramp. Nevertheless, if we assume no friction and only account for the vertical displacement, which is the same height that Charlie lifted the box, the work done by both would be the same because they displaced the box the same vertical distance against gravity. However, if we consider the actual distance moved along the ramp and the force applied, Lauren would exert the force over a longer displacement of 5 m:
W = F × d = 500 N × 5 m = 2500 J
Therefore, assuming that Lauren applies the force through the entire length of the ramp, she would indeed do more work due to the longer displacement even though the vertical change in both situations is the same. This indicates that not all of the 500 N force from Lauren is directed towards raising the height of the box; some of it is directed along the ramp to overcome gravity and any potential friction.
GIVING BRAINLIEST!!!
scientists suggest that galaxies are moving away from earth due to
a - dark energy
b - doppler shift
c - gravity
d - solar energy
Its dark enegry
Dark energy is like a rapid ageing proces to the earth, its not that the galxaies are moving away from us than that the earth is get bigger.
A scientist found a new species in a rain forest. The species was small and green in color. She examined one of its many cells and found that the celll has a nucleus but no cell wall. To which kingdom does this species most likely belong?
This species most likely belong to the animal kingdom, because it is multicellular with no cell wall.
Members of the kingdom Animalia are eukaryotes (organisms with true nucleus), multicellular and their cells do not have cell wall. If the cell had a cell wall, the specie could be a plant or fungi, but it does not have a cell wall so it is an animal. Animals exist in various sizes and colors and their cells contain many organelles that perform several functions that are important for their survival.
Answer:
animals, because it is multicellular with no cell wall
Explanation:
animals, because it is multicellular with no cell wall
Foaung Log
A log was cut from a tree and put in water. The log floated on its side so that half the log was above the water surface
Another log was cut from the same tree. This log was twice as long and twice as wide. How does the larger log float
compared with the smaller log?
1. Choose the best answer.
• More than half of the larger log floats above the water surface.
Half of the larger log floats above the water surface
Less than half of the larger log floats above the water surface
Answer:
The larger log floats the same as the smaller one, so the correct answer is that half of the larger log floats above the water surface (second option).
Explanation:
An object's ability to float when in water depends on its density, so two objects with different densities will float differently. Density is the relationship between the mass and volume of a material.
Objects with low density float more than denser objects, regardless of the amount of material.
Since the trunks come from the same tree, it can be assumed that they both have the same density, so they will float the same way, regardless of the size of each one.
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Which organism is a primary consumer? (see attached diagram, please explain answer)
krill
elephant seal
squid
penguin
Each category represents one of the functions of proteins. Match each example with the appropriate function.
Answer:
Maintaining homeostasis: Insulin controls the concentration of sugar in the bloodProviding structure: Collagen makes skin strong yet flexibleRegulating chemical reactions: Pepsin works in the stomach to speed up the breakdown of food.Fighting disease: IgA prevents the buildup of viruses and bacteria in the gut.Explanation:
Homeostasis is the maintenance of internal environment of the cell with respect to the external environment. In the first statement, insulin is controlling the sugar level in the blood cells. Thus it is an example of homeostasis.
Collagen is an abundantly found protein in the mammals. It provides structural support to the connective tissues, bones, and muscles.
Pepsin is a digestive enzyme that breaks down proteins into respective amino acids. Our food normally have proteins which are thus degraded by the action of pepsin enzyme.
Immunoglobulin A or "IgA" is an antibody that play a vital role in immune/defense system. More precisely, it provides protection against viral and bacterial infections, e.g. influenza virus infection.
Proteins in a cell can serve multiple functions, such as acting as enzymes to accelerate internal chemical reactions, acting as hormones that send signals across the body, functioning as antibodies to battle foreign bodies in the immune system, or carrying essential molecules like oxygen as done by hemoglobin.
Explanation:Without the specific examples and options for their functional categories, it's challenging to provide precise solutions to your question efficiently. However, I can help you understand the main functions that proteins can have in a cell based on standard biology knowledge. First, there are enzymes that act as catalysts to speed up chemical reactions within cells. Second, proteins can be hormones that transmit signals from one part of the body to another. Third, antibodies are proteins helping in immune responses by identifying and neutralizing foreign bodies like bacteria and viruses. Lastly, proteins, such as hemoglobin, can transport molecules like oxygen throughout the body.
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If the genotypes for baldness are B for the dominant allele and b for the recessive allele, what would the genotype be for a person who was Heterozygous Dominant for baldness. Remember the answer has to be two letters.
Answer: Bb
Explanation: a heterozygous genotype will always result in the dominant phenotype
Suppose you want to figure out the fastest route to walk home from school. You will try several different routes and time how long it takes you to get home by each one. Are the following variables true or false?
The independent variable is Varying the route you walk home.
The dependent variable is the time it takes.
The controlled variable is keeping the same person walking.
Question 5 options:
True
False
All the variables are true with respect to the statement provided.
"Varying the route you walk home" is the independent variable because it is purposely varied in the experiment. Different routes are being tested for their effect on the dependent variable.
"The time it takes" is the dependent variable because the independent variable changes the outcome. Route determines walk home time.
"Keeping the same person walking" is the controlled variable since it remains constant throughout the experiment to ensure that only route modification affects the outcomes. We eliminate the effects of walking speeds and skills by keeping the same person walking. Therefore, all the statements are true.
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How are animals and plants different? How are they the same? Be specific.
plants give off oxygen and take in carbon dioxide and animals take in oxygen and give off carbon dioxide.
seasons why do we have them
We have seasons because the earth is tilted as it makes its way around the sun. So its always pointed in one way at the sun, causing different asmophere as we go around the sun.