Flea
Bird
Caterpillar
Oaktree
А
Look at the ecological pyramid above. What can you tell from this ecological pyramid?
The trophic level of the birds have a lower blomass than the trophic level of the caterpillars.
Fleas belong to the trophic level of primary producers.
The trophic level of the oak trees has the lowest biomass,
All four trophic levels contain consumers.
B
С
D
C2020
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Answer:

The function of the pollen tube is to lead sperm cells into the ovary.

Explanation:

In angiosperms, the pollen tube is a structure formed when the pollen grain comes into contact with the stigma and germinates, producing a tubal extension that is related to the embryonic sac where the female gametophyte is found.

The function of the pollen tube is to conduct the male gametophyte —which is found in the pollen— to the embryonic sac, in order to come into contact with the oosphere and produce fertilization.

The other options are not correct because the pollen tube:

Answer: to lead sperm cells into the ovary .

Explanation: There needs to be a way for the sperm cells formed by the pollen's generative nucleus to reach the egg cells that are found in the ovary.

Answer: Only a single codon in the gene sequence is changed in base substitution mutation. Although a base substitution alters only a single codon in a gene, it can still have a significant impact on protein production.

Explanation:

Explanation:

Planarians are a group of Turbellaria, free-living flatworms that capture their food via a process of wrapping around it, entangling it in slime, and pinning it down before a prey into a gastrovascu lar cavity where free-living flatworms that capture extends from the mouth, bringing the prey into a gastrovascular cavity where free-living flatworms that capture extends from the mouth, bringing the digestion occurs.

correct answer is B; if the allele is expressed after reproduction has occurred.

The situation in which a gene pool contain an allele that causes a lethal disease is: (B) If the allele is expressed after reproduction has occurred.

When the allele is expressed after reproduction has occurred, individuals carrying the lethal allele can reproduce and pass on the allele before the disease is expressed. Since the disease may not manifest until later in life or after reproduction has occurred, the allele can persist in the gene pool without being selected against. Over generations, the allele frequency can remain relatively stable, leading to the presence of the lethal allele in the gene pool.

An allele can be defined as a variant form of gene. Alleles can exist in different forms due to changes in the DNA sequence. These changes can be substitutions, deletions, insertions, or other types of genetic mutations.

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Answer:

Physical

Explanation:

Your not chemically chewing a cracker, you physically moving your jaw to chew the cracker

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Answer:

expect

Explanation:

Answer:

When the ovum is fertilized by pollen tube core, it starts a process of differentiation which leads to the seed generation. In angiosperms, the fruit formation occurs from the ovary of flowers, simultaneously and in a similar way to the formation of seeds.

Explanation:

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Answer:

The energy form originated by electromagnetic waves or fields.

Answer : In radioactive decay, the half-life is the length of time after which there is a 50% chance that an atom will have undergone nuclear decay. It varies depending on the atom type and isotope, and is usually determined experimentally.

hope it will help you

Answer:d

Explanation:

I did the quiz

D is the answer

^_^

^ Above is the right answer

Answer:

Uracil (U) is a nitrogenous base found only in RNA but DNA is deprived of it. In DNA Thymine is found.

Explanation:

Answer:

True

Explanation:

They are surrounded by a plasma membrane.

Answer:

D: 4.6 x [tex]10^{9}[/tex]

Explanation:

4.6 x 10^{9} = 4,600,000,000

Earth is approximately, 4.6 billion = 4,600,000,000 = 4.6 x 10^{9}

The estimated age of Earth is 4.6x10⁹ years (D).

Scientists estimate the age of Earth through various methods, including radiometric dating of rocks and minerals. By analyzing the isotopes present in rocks and minerals, scientists can determine the decay rates of radioactive isotopes and calculate the time since the formation of those rocks.

Based on extensive studies and evidence, the current estimated age of Earth is approximately 4.6 billion years (4.6x10^9 years). This estimation is supported by multiple lines of evidence, including radiometric dating of rocks from different geological formations, lunar samples brought back from the Moon, and meteorites.

The age of 4.6 billion years is consistent with the age of the oldest rocks found on Earth's surface and the ages of the Moon and meteorites, which are believed to have formed around the same time as Earth. These dating methods provide a reliable framework for understanding Earth's geological history and the processes that have shaped our planet over billions of years.

It's important to note that scientific estimates and understanding of Earth's age continue to evolve as new evidence and research emerge. However, the current consensus among scientists is that the age of Earth is approximately 4.6 billion years, as indicated by extensive geological and radiometric dating studies.

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Answer:

Meaning, example of Peer reviewed article

Explanation:

Peer review refers to procedure of scrutinizing a researcher's scholarly work, by other experts & specialists in the similar field.

This provides an important advantage of this is proper scientific, logical verification of the study.

Examples of some peer reviewed journals : Journal of child & adolescent Psychiatric Nursing

Answer:

the article does not say

Explanation:

edge 22

Answer:

b.cell from a sunflower leaf

The structure that can have chloroplast is the cell from sunflower leaf. The correct option is B.

Chloroplasts are chlorophyll-containing organelles found in plant cells; they are necessary for Earth life because photosynthesis occurs in chloroplasts.

Proplastids give rise to chloroplasts, as do chromoplasts, leucoplasts, as well as other plastids.

Chloroplasts are plant cell organelles that use photosynthetic energy to convert light energy into reasonably stable chemical energy.

They survive life on Earth by doing so. Chloroplasts also perform a variety of metabolic functions for plant cells, such as the generation of fatty acids and membrane lipids.

Chloroplasts are found in all green plants and algae. Chloroplasts can also be found in photosynthesis that don't appear green, such as giant kelp's brown blades or certain plants' red leaves.

Thus, the correct option is B.

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Muscle and nerve cells are also alike in human beings and arthropods.  Both have brains, hearts, digestive tracts, reproductive organs, and muscle groups that do more or less the same matters.

Arthropods are invertebrate animals having an exoskeleton, a segmented body, and paired jointed appendages. Arthropods form the phylum Arthropoda. they may be outstanding by means of their jointed limbs and cuticle made from chitin, frequently mineralized with calcium carbonate.

Arthropods are beneficial for different meals that humans eat, especially thru the pollination of plants. greater than 100 food plants are pollinated via arthropods on a yearly basis. Bees, one of the foremost plant pollinators, also produce honey.

Arthropods also are invaluable to human beings, as they're used in many one-of-a-kind human-made products. Examples are: Bees produce honey and their honeycombs contain beeswax, broadly used for making candles, fixtures wax and polishes, waxed papers, antiseptics, and fillings for surgical uses.

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Answer:

Increasing  carbon dioxide  concentration  increases the  rate of  photosynthesis  as carbon  dioxide (CO2) is a limiting factor.

Explanation:

Some limiting factors like carbon dioxide, temperature etc. influence the photosynthetic rate, which may end up reducing the potential amount of carbohydrate produced by photosynthesis. Carbon dioxide is important for this form of biosynthesis: it provides the inorganic carbon that is integrated into carbohydrate molecules.

The photosynthetic rate can be slowed by a decline in the concentration of available carbon dioxide.

6 CO2 + 6 H2O + light  →  C6H12O6 + 6 O2

Carbon Dioxide + Water + Light       Glucose + Oxygen

Answer:

There are two types of cell division: mitosis and meiosis. Most of the time when people refer to “cell division,” they mean mitosis, the process of making new body cells. Meiosis is the type of cell division that creates egg and sperm cells. Mitosis is a fundamental process for life.

Explanation:

Answer:

An increase in population, resources, natural disasters, and catastrophic events. Weather, natural disaster, human activity. As a population reaches its carrying capacity, resources become more scarce.

Answer:

The landform marked with A is an ox-bow lake.

Explanation:

In the image, we can see a river and another fluvial landform right next to it. The river is meandering, moving through the plain in a zig-zag manner. The landform next to it has a half-circular shape, and it seems as it has been attached to the river until recently. In fact, the landform next to the river has been a part of the river until recently, but because of moving too far away from the base it became detached.

The landform in question is an ox-bow lake. This is a lake that has a short lifespan, and it usually has a half-circular shape, being just a few meters away from the river from which it formed. Initially, the ox-bow lake was actually part of the river and its meandering, but as the erosion was moving the water further and further away from the base of the river bed, the water was moving harder and harder, so naturally, the water moves in a direction where it is easier to do so. Little by little, the river starts to move in another direction, closer to its base, and the part of the meander that went too far away gets detached, thus forming an ox-bow lake.

Answer:

what notes

Explanation: