Answer:
1.5 billion years ago
Explanation:
Protists are a collection formed up of protozoa, unicellular algae, and fungus forms. We will focus on the being part of this society: the protozoa (proto = first, zoa = beings). Protozoa are the earliest discovered collection of heterotrophic living that utilize and modify complicated meal particles into power. Although protozoans are only made up of a single cell, these organisms control to perform all the necessary responsibilities of life. The protozoa are split into four principal associations: the ciliates, the flagellates, the heliozoans, and the amoebas.
Answer:
Option (C)
Explanation:
Protists are the kingdom that includes unicellular organisms. These organisms are eukaryotic in nature which means that it has a well-defined nucleus. They may be present in colonies or biofilm. But they re self-sufficient. Since the time of formation of these organisms, they have constantly undergone evolution forming a more complex type of organisms.
The first protists appeared during the proterozoic age at about 1.8-1.5 billion years back.
Hence the most appropriate answer is 1.5 billion years ago i.e option (C)
What is an advantage and a disadvantage to using color to identify a mineral?
Answer:
Advantage- it's easily observed; disadvantage- many minerals come in a variety of colors, so few can be identified by color alone. A mineral with a hardness of 6 will scratch a mineral with a hardness of (less/more) than 6.
Explanation:
Using color to identify a mineral can make the process easier and visually immediate, but it can be unreliable due to color variations or transformations under different lights.
Explanation:One advantage of using color to identify a mineral, such as the vibrant complexes formed by transition metals like malachite (green), azurite (blue), and proustite (red), is that it can be a quick and easy visual guide. Color can often provide immediate information about a mineral's chemical composition and structure.
However, the main disadvantage is that it is not always reliable. Minerals can come in many different shades and tints, due in part to variations in their chemical compositions or even impurities. Thus, solely using color may lead to misidentification. Another example of color usage is found in Fluorescence and Phosphorescence, where rocks and other materials might emit different wavelengths of light under UV lamp or 'black light', corresponding to their mineral composition, and these colors can be very different from the mineral's color in normal light.
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Name the type of bond that is created when the following substances combine. (Terms may be used more than once.)
The first one is 2
The second one is 1
The third one is 2
The fourth one is 3
The last one is 1
The mass of an atom is contained primarily in its _____. electron shell nucleus protons size
Answer:
Nucleus
Explanation:
A solution contains the same number of hydronium ions as hydroxide ions. Is the solution acidic, basic or neutral? What is the pH of the solution?
A solution containing equal concentrations of hydronium and hydroxide ions is considered neutral. The pH scale measures these concentrations with pH 7 indicating neutrality. pH is calculated as -log [H3O+].
Explanation:If a solution contains the same number of hydronium ions as hydroxide ions, this means the solution is neutral. This is because in a neutral solution, the concentrations of hydronium and hydroxide ions are equal. The pH of a neutral solution is 7.
These ions exist in all aqueous solutions and their concentrations are inversely proportional as determined by the ion product of water (Kw). Hence, the pH scale is utilized to express hydronium and hydroxide ion concentrations in a solution. A solution is considered acidic when it has a greater concentration of hydronium ions than hydroxide ions, and basic when it's the other way round.
The pH is calculated as -log [H3O+] and in this case, −log (1.0 × 10-7) which equals 7.00. Thus, basic solutions are those with hydronium ion molarities less than 1.0 × 10-7 M and hyrodixide ion molarities greater than 1.0 × 10-7 M thereby corresponding to pH values greater than 7.00. On the contrary, acidic solutions exhibit the inverse.
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Distinguish between primary and secondary succession.
Primary Succession Gradual growth of organisms in an area that was previously bare, such as rock. (For example lichens, mosses, and ferns will first appear on bare rock). The Following Steps: Secondary Succesion It is the series of community changes which take place on a previously colonized, but disturbed or damaged habitat, (examples include areas which have been cleared of existing vegetaion such as a tree-felling in a woodland). Primary succession occurs following an opening of a pristine habitat, for example, a lava flow, an area left from retreated glacier, or abandoned strip mine.
In contrast, secondary succession is a response to a disturbance, for example, forest fire, tsunami, flood, or an abandoned field. Compare && Contrast Primary Succession starts at bare rock. Secondary Succession starts with soil and dirt already there. Secondary Succession takes 100 +(plus) years to develop. Primary Succession takes thousands of years to develop.
The two name system that Linnaeus developed classifies organisms by
Answer:
genus and species
Explanation:
i took test just yesterday
Annika has a friend named pedro how are similar are annikas and pedro DNA
They are both Homo Sapiens, so we know that their amino acid sequence will be the same making the DNA of both individuals very similar. According to studies, our DNA's are 99,4% - 99,9% similar, having only a 0,1% - 0,6% variation between two human individuals.
Hope it helped,
BioTeacher101
" Annika and Pedro share approximately 99.9% of their DNA.
Humans share a vast majority of their DNA with one another, regardless of their cultural or geographical differences. On average, any two humans will have DNA that is 99.9% identical. This means that Annika and Pedro, as two individuals selected at random from the human population, would also share about 99.9% of their DNA.
The 0.1% difference in DNA accounts for the unique characteristics that make each person distinct, such as hair color, eye color, height, and other physical traits, as well as susceptibility to certain diseases. This variation is due to differences in the DNA sequence known as single nucleotide polymorphisms (SNPs), insertions, deletions, and copy number variations.
It's important to note that while the average genetic similarity between humans is 99.9%, this does not mean that any two individuals are exactly 99.9% similar. There is a small range of variability around this average. However, for the purpose of understanding the genetic similarity between Annika and Pedro, or any two unrelated individuals, the figure of 99.9% is a useful and accurate estimate.
In summary, the genetic similarity between Annika and Pedro is reflective of the genetic similarity shared by all humans, which is approximately 99.9%. This high degree of similarity is a testament to the shared ancestry and close relatedness of all people within the human species."
Why are there no gram-positive archaea species, but there are gram-positive bacteria species? A. Archaea lack peptidoglycan
B. Archaea do not have a cell wall
C. Archaea lack chitin
D. Archaea do not have a cell membrane
Answer:
A. Archaea lack peptidoglycan
Explanation:
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Answer:
A. Archaea lack peptidoglycan
Explanation:
why do we need to protect our oceans from pollution
We need to protect our oceans from pollution because it harms marine ecosystems, affects human health and livelihood, and contributes to climate change.
Climate change exacerbates other ocean problems, such as coral bleaching, which affects the rich biodiversity within coral reefs, important nutrients for marine life, and the provision of protein for millions of people. Furthermore, coral reefs serve as natural barriers against disasters like tsunamis, and they greatly contribute to tourism.
Ocean water pollution illustrates that despite their vastness, oceans are highly susceptible to pollution. Trash, including plastics, not only contaminates coasts but can also create hazards for marine animals, leading to entanglement or ingestion of inedible materials. Oil spills, like the incident in the Gulf of Mexico in 2010, can devastate marine species and destroy coastal habitats.
Human activities, driven by our standard of living and neglect of coastal pollution controls, also play a significant role. Runoff from land carries pollution to the sea, compounded by direct waste disposal into coastal waters in certain regions. Plastic pollution is a challenge that could be mitigated by banning single-use plastics and improving recycling programs
Compare and contrast the 2 major groups of cells: prokaryotes and eukaryotes
What is the role of oxygen gas (O2) in glycolysis?
The first stage is called glycolysis and does not require oxygen. In this stage, ATP molecules are used to help break down glucose into a substance called pyruvate, a molecule that transports electrons called NADH, two more ATP molecules, and carbon dioxide. ... The final stage is called electron transport phosphorylation.
Final answer:
While glycolysis does not require oxygen, oxygen is critical in the steps that follow. It serves as an 'electron magnet' in the electron transport chain and helps regenerate NAD+ from NADH, thereby enabling the continuation of cellular respiration and the production of a significant amount of ATP.
Explanation:
Glycolysis is an anaerobic process and does not require oxygen to proceed. However, oxygen plays a critical role in the later steps of cellular respiration, where the NADH produced in glycolysis can be oxidized. In the presence of oxygen, this process is efficient and leads to the production of much more ATP than glycolysis alone. The oxygen acts as an 'electron magnet' in the electron transport chain, helping to drive electron flow, which is crucial for ATP synthesis. It also regenerates NAD+ from NADH, which is essential for both glycolysis and the citric acid cycle to continue.
In facilitated diffusion, do molecules move down their concentration gradient?
Facilitated diffusion is a process where molecules move from an area of higher concentration to lower concentration with the aid of protein channels or carriers in the cell membrane.
Explanation:Yes, in facilitated diffusion, molecules do move down their concentration gradient. This means that molecules will move from an area of higher concentration to an area of lower concentration. However, unlike simple diffusion which occurs directly across the plasma membrane, facilitated diffusion involves the use of protein channels or carriers within the cell membrane to help the passing of molecules. These proteins 'facilitate' the transport of molecules which would otherwise have difficulty penetrating the cell membrane due to their size or charge, hence giving it its name.
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What is the main difference between aerobic respiration and anaerobic respiration?
Answer:
Aerobic respiration requires oxygen to proceed, but anaerobic respiration does not.
Explanation:
What does a Chiropracter do?
How to rewrite the sentence with "different…from"?(Question 3)
Different from is the usual phrase. Traditionalists persistently avoid different than, particularly in easy examples, such as She are different from him. More-liberal scholars show that a sentence like It is not unusual for men as compared to it is for women clear and short, and writing it with another form could appear in a clumsy clunker.
What are some common features in prokaryotic and eukaryotic
The common features present are;
Presence of DNA material in one or morechromosomesThey both have a plasma membrane that has a phospholipid bilayer with proteinsThey both contain cytoplasma that contains the cytosol and organnelsThey both have ribosomes for the synthesis of proteins.Domestic cats transfer their genetic information to their offspring by meiosis. If a kitten has 38 chromosomes, how many chromosomes does the kitten inherit from its mother A.) 12 Chromosomes B.) 19 Chromosomes C.) 30 Chromosomes D.) 38 Chromosomes
Since domestic cats reproduce through meiosis, each parent gives off half of their genetic code (or DNA) to their offspring. The answer would be B, 19 chromosomes because that is half of 38. That is why when a parent gives birth to their child, they don't look exactly the same or act exactly the same as either of their parents. They are a mix of both, which is another explanation for why no two people look exactly alike.
You may wonder, a domestic cat births more than one offspring at a time. If multiple offspring share the same parents, why don't they look the same? The reason for that is because the half DNA that the parent is giving off is a different half than they gave to another offspring, if that makes any sense.
Hope that helped you! :)
A catalyst is a substance that does what?
A. It speeds up a chemical reaction, but is consumed in the process.
B. It slows down a chemical reaction, without being consumed in the process.
C. It speeds up a chemical reaction, without being consumed in the process.
D
It slows down a chemical reaction, but is consumed in the process.
The answer is C. A catalyst speeds up the rate of a chemical reaction. However, it is not consumed during the course of the day.
What problems would you expect to observe in an ecosystem without secondary consumers? Be sure to answer this question in paragraph form using complete sentences.
If there weren't secondary consumers, then the primary consumers population would increase. Also, plant life would be threatened, which would cause increased difficulty for primary consumers to survive after they overpopulate.So the population increases in producer (and probably producer diversity) and decreases in secondary, tertiary and higher order consumer populations.
question answered by
(jacemorris04)
There would be a lot of herbivores. Also their would be a lack of vegetation eventually in their area because the secondary consumers will not eat most of the primary consumers like deer and squirrels which in turn will eat all of the vegetation. This would conclude that the herbivores would eventually die do to starvation, that is why the meat eaters are needed in a ecosystem.
Hope this helps just took this quiz today and got a 4/4 on my answer so hopefully this will help you guys.
Cheers!
A. How do the Earth’s physical factors influence population density? When population growth increases in an area, what is happening to the birth rate and age structure of that population? (Site 1)
Answer:
The physical factors of the Earth affect population density by becoming a key determinant in which the individuals opts to live. The majority of the individuals desires to live in an area closer to their place of interest, where the climate is accessible and favorable. When there is an elevation in population, the rate of birth becomes high, and the age structure of the population becomes like a pyramid that signifies that more of the individuals in the population belongs to a younger age.
Earth’s physical factors greatly influence population density
It is because on physical factors people depends. Physical factors that affect population density are water, climate, land shape, vegetation, soils and availability of natural resources etc. If these factors are present in large quantity then the population density will be higher and vice versa.
When population growth increases in an area, the population of a country has a triangle-shaped age structure which represents higher population of younger individuals and lower number of aged people.
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explain the how protein contained in seeds or milk is useful for the plant sprouting from the seed or the baby mammal
Not even understanding the question tbh
A body cell has been growing and synthesizing proteins. In the nucleus of this body cell, DNA replication is taking place, and a copy of the cell's genetic material is copied. Which of the following is the best conclusion you can make about the life cycle of this cell. A. The cell is ready to undergo mitosis, and a chemical signal will send the cell to pro phase. B. The cell is undergoing meiosis and will cross over the genetic material next. C. The cell is in the S phase of interphase and will move next to the G2 phase. D. The cell is in the G2 phase of interphase and is ready to begin dividing.
Hey lassie. Here is your answer for this question.
The genetic material is replicated in S phase. It will grow again in the G2 and then go into meiosis.
So your answer is B. The cell is undergoing meiosis and will cross over the genetic material next.
Hope this helps!
Answer: B. The cell is undergoing meiosis and will cross over the genetic material next.
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The diagram represents one of Mendel’s laws or principles of inheritance
i cannot see the diagram but you mentioned medels law so it is for a fact -(segregation)-
The diagram represents one of Mendel’s laws or principles of inheritance. Which law or principle does the diagram represent?
Answer:
segregation
Discuss 2 ways in which efforts to protect species can lead to controversy
Protection of certain species is a very controversial topic. Many species like the mountain lion or jaguar that are near extinction in certain areas, are threats to human life. Another reason is that they could off set the food chain when they come back and be stonger than ever. For example the mountian lion could eat out the thriving white tail deer population which was struggling because of the mountain lion. And many people rely on white tail deer for food.
Hope this helped :)
Threats to human existence include numerous species, such as the mountain lion and the jaguar, which are on the verge of extinction in some regions.
How to conserve species?The question of protecting particular species is highly contentious. Another concern is that, if they return stronger than before, they can upset the food chain.
The mountain lion might decimate the abundant population of white-tailed deer, which was suffering as a result of the mountain lion. Additionally, a lot of people rely on white-tailed deer for sustenance.
There is a lack of technical competence in many nations that serve as habitat for endangered species. Increased capacity building would also be advantageous for local and international conservation organizations.
Therefore, the preservation of species might not be given top priority at the national level.
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Summarize the processes that formed the ocean
Seafloor spreading is a process that occurs at mid-ocean ridges, where new oceanic crust is formed through volcanic activity and then gradually moves away from the ridge. Seafloor spreading helps explain continental drift in the theory of plate tectonics.
Denser materials sank to the earths center and less dense materials were forced to the outer layers, forming a thin crust. Atmosphere: Less dense molecules rose to the surface. Oceans: As earth cooled, water vapor condensed to form rain which lead to the formation of oceans.
Imagine a species of butterfly that comes in a variety of colors how can this type of diversity affect the population
Color diversity within a butterfly species affects its survival and evolution, allowing for natural and diversifying selection that can influence the population's genetic variance. Studies, such as those on yellow buntings' responses and the dependence of Karner blue butterflies on wild lupine, illustrate how color variation can impact ecological dynamics and conservation.
Color diversity within a butterfly species can have significant effects on the population's survival and evolution. In a hypothetical scenario, where butterflies exhibit varying colors, these colors may play a role in the butterflies' ability to avoid predators, seek mates, or exploit different ecological niches. For example, in the case of yellow buntings showing fleeing behavior from butterflies with eyespots, the data could suggest that these butterflies have developed a defensive trait that can influence natural selection. Predators avoiding butterflies with eyespots may lead to an increased frequency of this trait within the butterfly population.
This selective pressure could cause a shift in the population's genetic variance, favoring butterflies with eyespots. Likewise, diversifying selection might occur if different colors confer advantages in different environments (e.g., light-colored butterflies in sandy areas and dark-colored ones in dark forests). Counting and observing the impact of color diversity on a specific butterfly population, such as the federally endangered Karner blue butterfly, can inform conservation efforts and aid in understanding ecological dynamics.
Additionally, human activities such as the selective capture of colorful fish, or pollution altering habitats, can induce artificial selection or environmental changes that rapidly shift the phenotype distribution in animal populations. The key to a species' long-term survival could heavily rely on the biodiversity reflected in color variations amidst different environmental pressures.
What is soil profile?
What is the carbon cycle
The carbon cycle is a natural and integral part of life on Earth. A single carbon atom stored in a blade of grass may shift to the body of an animal that eats the grass.
what is microbiology
microbiology is the study of microorganism like viruses, bacteria and another microbes that are invisible for the human naked eye.
Its the study of microorganisms, which are the smallest living organims, most of them being unicellular.
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BioTeacher101
what must happen for a hypothesis to become a theory?
When a hypothesis is proven by an experiment then it becomes theory.
If enough evidence accumulates to support a hypothesis, it moves to the next step — known as a theory in the scientific method and becomes accepted as a valid explanation of a phenomenon.
Hypothesis is constructed before any applicable research has been done. A theory, on the other hand, is supported by evidence.