BIOLOGY MIDDLE SCHOOL

What makes evolution a theory?

Answers

Answer 1
Answer:

Answer:

b/c it had to be theorized to be proven right

Explanation:
Answer 2
Answer:

Answer:

A scientific theory is a well-substantiated explanation of such facts. The facts of evolution come from observational evidence of current processes, from imperfections in organisms recording historical common descent, and from transitions in the fossil record.

Explanation:

A scientific theory is a well-substantiated explanation of such facts. The facts of evolution come from observational evidence of current processes, from imperfections in organisms recording historical common descent, and from transitions in the fossil record.

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What are three materials transported by global ocean circulation?

Answers

Three materials transported by global ocean circulation are water, nutrients that are brought to the surface of the water and oxygen that is taken from the surface and sent to the deep ocean.

The rungs or steps of the ladder would be the

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The bases.

Hope this helps!

-Payshence

A heterozygous round seeded plant (Rr) is crossed with a homozygous round seeded plant (RR).What percentage of the offspring will be homozygous dominant (RR)? _______

Answers

The percentage of plants that have the dominant RR is 50%.

According to Mendel, factors of inheritance called genes are located in the chromosomes. Genes usually occur in pairs called alleles. The genes in an allelic pair may be dominant or recessive. The dominant gene is always expressed while the recessive is only expressed in the absence of the dominant gene.

Using a Punnet square, we can see that the percentage of plants that have the dominant RR is 50%.

Learn more: brainly.com/question/20906233
So I don’t see answer choices here, but your answer is 50% of the offspring will be homozygous dominant with RR, and 100% of them will carry a homozygous dominant gene of Rr

If you take the two sets and put them into a punnett square, it would look like this (image attached):

When the two sets of alleles are crossed, you would end up with half of your pairs being fully dominant (RR), and the other half being dominant while containing a recessive gene (Rr). Since there’s only one recessive gene in these pairs, it gets overridden and the pair itself is dominant.

So your answer is 50% will be homozygous dominant with RR!

What are some examples of index fossils

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Answer:

Ammonites, , Brachiopod, Grapolithina,Trilobites and Nanofossils are examples of index fossils

Explanation:

Ammonites were common during the Mesozoic Era (245 to 65 mya), but were not found after the Cretaceous period. They went extinct during the K-T extinction (65 mya)

Brachiopods which are mollusk-like marine animals appeared during the Cambrian (540 to 500 mya). Some types of them still survive

Grapolithina which are widespread colonial marine hemichordates that also lived during the Cambrian period.

Nanofossils are microscopic fossils which are remains of calcareous nannoplankton, coccolithophores from various eras

Trilobites were common during the Paleozoic Era (540 to 245 mya); about half of the Paleozoic fossils are Trilobites. Trilobites evolved at the beginning of the Paleozoic Era and went extinct somewhere in the late Permian period which was 248 million years ago

This might be extra information but i hope it helps

What is important in helping living things survive.Explain why living things need nitrogen.

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Nitrogen makes up part of the proteins and DNA in our and other organisms cells. 
Sunlight.
Living things need nitrogen because it forms a part of the proteins and DNA that are found in cells. Animals get nitrogen from eating plants and other animals and just like animals, plants require nitrogen to grow and survive.

Dna strands serve as which of the following during dna synthesis

Answers

Replication is involved in duplicating and copying genetic material. DNA strands serve as templates during DNA synthesis. Thus, option c is correct.

What is a template strand?

In DNA replication, the parent strand act as the template strand and is used by DNA polymerase to make the copy by attaching the complementary bases.

The daughter strand formed is semi-conservative in nature. The parent strand acting as template results in leading and lagging strands.

Therefore, the DNA strand act as a template.

Learn more about template strand here:

brainly.com/question/22212326

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The complete question is attached to the image below.

When the parental DNA strands are separated, a replication bubble forms to allow the new daughter nucleotides access to the template strands of DNA
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