Why does fern reproduction require two generations?
Final answer:
Fern reproduction requires two generations due to the alternation of generations in its life cycle, with a dominant sporophyte stage producing spores and a less visible gametophyte stage for sexual reproduction. This cycle ensures genetic diversity and adaptation to different environments.
Explanation:
Fern reproduction requires two generations due to its life cycle involving alternation of generations, which includes both sporophyte and gametophyte stages. The sporophyte generation is the more visible phase in ferns, characterized by leafy fronds with undersides dotted with clusters of sporangia, which produce spores. These spores develop into tiny, heart-shaped gametophytes, which are much less visible and contain reproductive organs called antheridia (producing sperm) and archegonia (producing eggs). Fertilization occurs when flagellated sperm swim to an egg within an archegonium, leading to the formation of a new sporophyte, thus completing the cycle.
The presence of two distinct generations, each fulfilling different roles in reproduction and survival, highlights the complexity of fern life cycles. This alternation of generations ensures genetic diversity and allows ferns to adapt to varying environmental conditions. The gametophyte stage, though less conspicuous, plays a crucial role in the sexual reproduction phase, while the sporophyte stage is dominant and responsible for spreading spores widely.
The thick mass of grass roots that helps hold prairie soil in place is called
Answer:
It is John Deere's Plow
Explanation:
YW
True or False: Kevin selected a lightweight pan in which to deep-fat fry the doughnuts. Aidan knows this is a safe procedure.
In April 2009, a new strain of influenza A emerged. This strain, known as the swine flu, caused at least 95 deaths in over 40 different countries. The rapid spread of this disease can be attributed to WHAT?
Answer:
The answer is ALL OF THESE
Explanation:
In April 2009, a new strain of influenza A emerged. This strain, known as the swine flu, caused at least 95 deaths in over 40 different countries. The rapid spread of this disease can be attributed to
DOMAINS AND KINGDOMS
1. If an organism is unicellular, a eukaryote, and autotrophic, into which domain would it be classified? *
Question options:
A.) Domain Eukarya
B.) Domain Archaea
2. Kingdom Fungi
Question options:
Eukaryotic
Prokaryotic
Unicellular
Multicellular
Both (Unicellular/Multicellular) <<<<
Autotrophic
Heterotrophic <<<<
Both (Autotrophic/Heterotrophic)
i need one more??
3. Kingdom Protista
Question options:
Eukaryotic
Prokaryotic
Unicellular
Multicellular
Both (Unicellular/Multicellular) <<<<<<
Autotrophic
Heterotrophic
Both (Autotrophic/Heterotrophic)<<<<<<
i need one more??
which symbol represents a hybrid
A Aa
B BB
C De
D cc
ANSWER FASSSSSSSTTT PLEASE
In genotypic terms, a hybrid organism is represented by a combination of both dominant (A) and recessive (a) alleles. Therefore, the option A. Aa symbolizes a hybrid organism.
Explanation:In genetics, a hybrid organism is one that possesses a mix of characteristics. This is usually indicated by a combination of both dominant and recessive alleles in its genotype. So, symbolically, the option that represents a hybrid is A. Aa.
This pattern signifies a pair of alleles, where 'A' is dominant and 'a' is recessive. This results in a heterozygous genotype and is characteristic of hybrid organisms. Other options such as 'BB' and 'cc' represent homozygous genotypes and 'De' is not standard notation in genetics.
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Earthworms are a species of worms that lives in moist soil along with other organisms like tiny insects and bacteria. Earthworms obtain water and nutrients by eating dead plant material found in the soil. Earthworms also release waste materials that help enrich the soil. Based on this information, which sentence is correct?
Answer:
D. Soil is the earthworm’s habitat.
Explanation:
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Attempting to both study and watch television is an example of divided attention.
true or false
Attempting to both study and watch television is an example of divided attention is true. Many people are examples in this world. Multi-tasking enables a user to perform more than one job at a time.
Therefore, this condition is true and many people study in this fashion like they study and watch T.V at the same time. Divided attention is a kind of contemporary attention which enables a person to treat various type of data and to do multiple tasks at a time.
When a star's nuclear energy runs out, it dies. A star can die in many ways. A _____ is one way a star might die, and it can trigger the beginning of a new star's life cycle.
red giant
white dwarf
black dwarf
supernova
Which describes a disadvantage of social behavior?
Final answer:
A disadvantage of social behavior is social loafing, where individuals contribute less in a group setting, leading to reduced group productivity. Additionally, technological influences on social behavior can risk social isolation and autonomic nervous system disorders.
Explanation:
One disadvantage of social behavior is the phenomenon of social loafing. Social loafing occurs when individuals in a group contribute less effort to a task than they would if they were working alone. This tendency leads to diminished productivity and output within the group, as some members might rely on others to pick up their slack. This behavior can negatively impact group dynamics and overall performance, making many individuals dread group work, particularly when tasks require equal participation from all members.
Moreover, social behaviors influenced by technology might contribute to social isolation, reducing face-to-face interactions and potentially leading to loneliness and depression. As individuals become more reliant on electronic means of communication and social media, there is a heightened risk of disorders related to the autonomic nervous system, which includes deficits in social engagement and the capacity for love.
Each genus of organisms is divided into classes. Please select the best answer from the choices provided True or False
Answer:
true
Explanation:
what body system eliminates urine as a waste product from the human body?
some heterozygous alleles create variations in expression so that there is not a clear dominant or recessive allele true or false ?
Answer: False
The variations in expression depends on how genes code for proteins that would specify whether it will be dominant or recessive allele. Within a population, there may be a number of alleles for a given gene and these differences can cause variations in the protein that is produced. The change in protein expression affect traits due to the variations in protein activity or expression that produce different phenotypes.
Moreover, individuals that have copies of different alleles are known as heterozygous and individuals that have two copies of the same allele are referred to a homozygous. The expression patterns observed in inheritance will depend on whether the allele is found on an autosomal chromosome or a sex chromosome, and on whether the allele is dominant or recessive.
(18 POINTS)
Which of these groups of animals is endangered?
(a) Dinosaurs
(b) Killer Whales
(c) Mice
(d) Komodo Dragon
I did the research on this one and both the killer whales and the Komodo dragon are endangered, but I can't really tell which one is the answer.
The species of the habitat that are on the verge of extinction or perishment are called endangered species. Komodo Dragon is a group of animals that is endangered.
What is endangered species?The species that are most likely to become perished in the future in a particular habitat or overall on the planet is called the endangered species. This may be due to extensive hunting, habitat destruction or the introduction of non-native and competitive species.
The data about the killer whale population is deficient and cannot be categorized appropriately in the endangered category while Dinosaurs are extinct species.
Komodo Dragon is now considered an endangered species as their population had declined rapidly due to climate change and the decrease in the deer population which is their major prey are the most likely to make them vulnerable.
Therefore, option (d) Komodo dragon is an example of endangered species.
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If it weren't for Newton's _____ law, regarding inertia, the planets would travel in a straight line into space. Gravity is the outside force that keeps the planets in orbit about the Sun.
first
second
third
The number of what is a defining characteristic of the two types of angiosperms.
Answer:
cotyledons
Explanation:
cotyledons are the differnece and monocots has one cotyledons and dicots have two!
The number of cotyledons is a defining characteristic of the two different types of an angiosperm.
What are Cotyledons?A cotyledon can be defined as a significant part of the embryo of a plant which is present within the seed of a plant, and it is defined as the embryonic leaf in the seed-bearing plants, one or more of these cotyledons are the first to appear from a germinating seed in a plant.
Number of cotyledons is the number of cotyledons which are found in the embryo of the plant, which is the actual basis for distinguishing the angiosperms into two major classes, and it is the source of the names such as Monocotyledonae or one cotyledon and Dicotyledonae or two cotyledons. The cotyledons are the seed leaves, which are produced by the embryo.
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In which phase does crossing over occur (where the homologous pairs exchange genetic information)?
Prophase I
Prophase II
Prophase III
Answer:
Prophase l is correct If ya have Usa Test prep
which of the following best describes protists?
A)They are a diverse group of eukaryotes that include several unrelated lineages.
B)They are a diverse group eukaryotes with a single common ancestor.
C)They are a diverse group of prokaryotes that includes several unrelated lineages.
D)They are diverse group of prokaryotes with a single common ancestor
They are a diverse group of eukaryotes that include several unrelated lineages.
What are protists?Protists are unicellular, eukaryotic, and microscopic organisms.
They have some characteristics of both plants and animals.
Examples are amoeba, euglena, plasmodium, etc.
They can be parasites.
They live in moist areas and water.
Thus, the correct option is A)They are a diverse group of eukaryotes that include many unrelated lineages.
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Since all living organisms use the same four nucleotides in DNA structure, what is it that makes individuals unique?
A)the incidence of the STOP codon in DNA
B)the sequence of nucleotides in the DNA
C)the location of the phosphate group on the DNA backbone
D)the number of cytosine repeats in one strand
When did the first frog appear on Earth?
Answer:
The correct answer will be around 250 million years ago.
Explanation:
Frogs are the cold-blooded animals which lives in both water and land. So, they belong to the class amphibia.
The first amphibians appeared during Devonian period around 370 million years ago when life moved on land from water but the evolution of frogs is a debated topic.
Fossil evidences have shown that they evolved around 250 million years ago during the early Triassic period from Triadobatrachus, or triple frog. The earliest known true frog was tiny Vieraella species found in the South America.
Thus, frogs appeared for the first time around 250 million years ago.
Analyze the given diagram of the carbon cycle
An image of carbon cycle is shown. The sun, a cloud, two trees, one towards left and the other towards right, an animal, lake, and a factory are included. Arrow A points from the sun to the left tree. Arrow B points from the air above the clouds to the left tree. Arrow C points from the factory towards the air above the clouds. Arrow D points from the air to the lake labeled Carbonates in Water. Arrow E points from the label Dead Organism under the animal to label Fossils and Fossil Fuels. Arrow F points from the right tree to the air.
Part 1: Which process does arrow C represent?
Part 2 Name a process that could release the compound into the air
Part 3: explain how the elements that form it are conserved during carbon cycle
Use complete sentences to explain your answer.
Part 1: The process which arrow C represent is the burning of fossil fuels to introduce Carbon Dioxide (CO₂) into the atmosphere. This process in the Carbon Cycle is relatively new since humans weren't able to produce large amounts of Carbon Dioxide by burning fossil fuels until the Industrial Revolution. This could also represent the process of cement manufacturing since it releases CO₂ by the following reaction:
CaCO₃ → CaO + CO₂
Part 2: A process that could release the compound into the air is the burning of fuels. This is an oxidation reaction in which the carbon present in form of Hydrocarbons in the fuel is oxidized to CO₂ by the oxygen in the atmosphere. The CO₂ produced is in the gaseous state, and is incorporated into the air. It also contributes to the greenhouse effect. The combustion reaction for the most simple hydrocarbon, methane (CH₄) is shown below:
CH₄ (g) + 2O₂(g) → CO₂(g) + 2H₂O (g)
Part 3: The elements that form it are conserved during carbon cycle by the Law of Conservation of Matter. This Law states that in chemical reactions, the matter is neither produced nor consumed, it only transforms. So, during all chemical processes in the Carbon Cycle, Carbon atoms are never destroyed but they change and rearrange into different molecules. This cycle is key to the sustaining of life on Earth.
The Calvin cycle of photosynthesis begins when
A. light becomes available.
B. electrons leave a photosystem.
C. the reduction of carbon dioxide occurs.
D. carbon dioxide is attached to RuBP.
Tina is conducting an investigation on bicycle helmet aerodynamics. She is trying to find out what kind of helmet causes the least amount of air resistance. She tested three different helmets, using the same rider each time. She recorded the time it took for the rider to complete one circuit on a track in the table below.
Helmet Time in Seconds
A 35
B 28
C 41
How could Tina get more reliable data for this experiment?
Some steps in cell division are shown below: 1. Chromosomes condense and pair up 2. Segments of DNA of sister chromatids twist and cross 3. Exchange of DNA occurs between chromosomes 4. Haploid chromosomes condense Which of the following steps is least likely to occur during meiosis 1?
Sorry I'm late :P But if you still were interested in the answer, it's Step 4. Got it right on the test.
Steps in the cell division that occurs during meiosis 1 are :
Chromosome condense and pair upSegments of DNA sister chromatids twist and crossExchange of DNA occurs between homologue chromosomeThe process that is least likely to occur during meiosis 1 is :
Haploid chromosome condensation - because this occurs during meiosis 2.Meiosis It is a process during which exchange of genetic material between the homologue chromosome and such division yield four haploid cells.The diagrammatic representation of meiosis is shown below :To know more about meiosis :
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Which of the following correctly contrasts the ureter and the urethra?
A small duct known as the ureter connects the kidneys and bladder. The urethra is the cylindrical way that interfaces the bladder to the body's outside, permitting pee to leave the body.
What are the functions of ureter and urethra?Urine travels through the ureters from the kidneys to the urinary bladder, where it is temporarily stored. The urethra is a structure made of tubules that carries urine outside the urinary bladder.
There are three layers in the ureter: outer adventitia, muscularis, and the innermost mucosa. Circular transitional epithelium lines the mucosa. The waterproof properties are due to the keratin in this layer.
The primary contrast among ureter and urethra is that ureter channels pee from kidney to bladder while urethra channels pee from the bladder to the beyond the body.
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How do the nutrients in soil become building materials for a plant to grow?
The nutrients from the soil is taken up by the roots to be distributed to the entire plant. The plant absorbs the nutrients into its cells and utilized by the leaves, stem, trunk. They are also used to grow flowers and to bare fruits.
Moreover, the nutrients are divided into two groups; first the macronutrients which is needed by the plants in large amount such as nitrogen, phosphorus, potassium, calcium, magnesium and sulfur. Second group is the micronutrients, needed in tiny amounts that include zinc, copper, manganese, boron, iron, sodium and cobalt. These two groups are essential for normal plant growth and development.
As the water velocity decreases, the size of the particles that the water can transport increases. Please select the best answer from the choices provided T F
The given statement is False.
As the water velocity decreases, the size of the particles that the water can transport also decreases. For example, as the velocity of the stream increases, the stream can carry larger sediments. It is noted that the physically weathered sediments are bigger in particle size in comparison to the chemically weathered particles.
In case, if the velocity of water is too slow and the slope is too gentle, then the rate of transportation of sediments also decreases and the sediments get to pile up.
What happens when an oceanic and a continental plate collide?
Answer:
The oceanic plate sinks below the continental plate.
Hope this helps.
Explanation:
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What type of infection is transmitted by athlete's foot?
Bacterial
Fungal
Parasitic
Viral
fungal because it is a foot fungus.
Due to the increase in global temperatures, the range of plants and insects is increasing. The negative impact is that they now affect the local organisms in the area. What name do we use to refer to these plants and insects?
Answer:
The correct answer is - invasive species.
Explanation:
An invasive species is a species that can be plant, insect, fungus and any other type of organism that does not belong to a particular area or location but causing the harm to the ecosystem of that area.
They can be harmful by different aspects such as environmental, the economy and the health of humans.
Thus, the correct answer is - invasive species.