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Alecsey [184]
3 years ago
7

During which era in earth's history were the first insects?

Biology
1 answer:
nordsb [41]3 years ago
6 0
According to the evolution theory, the first insects appeared about 400 million years BC in the Devonian Period. 
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All of the following are true of all parasites except
Ede4ka [16]

Answer:

A.

Explanation:

A parasite does not feed it's host; in fact, it takes food energy/ food from it's host.

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During pregnancy under what condition is Rh factor incompatibility a problem
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what type of qustion is this

Explanation:

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Polydactyly is an autosomal dominant trait in which affected individuals have more than five fingers and/or toes. If a pedigree
bija089 [108]

Answer:

Reduced penetrance or incomplete penetrance

Explanation:

Penetrance refers to the extend which a certain gene or set of genes is expressed in a population.

It can be complete where there is expression of the gene in a population having it.

Whereas, in reduced penetrance is where the mutation is not expressed in every individual in the population having it.

For instance polydactyly exhibits reduced penetrance since the parents had the mutation it was not expressed it came to be expressed on their pedigree.

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3 years ago
If r(x) = 3x – 1 and s(x) = 2x + 1, which expression is equivalent to r over s (6)
Maksim231197 [3]

3(6)-1

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2(6)+1 is the answer

3 0
3 years ago
Read 2 more answers
Explain the role of the cork cambium in woody plants.
kiruha [24]

Answer:

The cork cambium is a natural insulator that protects woody plants from an hostile environment.

Explanation:

The cork Cambium is a tissue that belongs to the epidermis, it is responsible for the secundary growth in the plant and replaces the epidermis in roots and stems. The cork cambium also protects the plant from overhydration, it is waterproof and has really selective ways to let the water into the plant (apoplastic and symplastic pathway).

There is some special plants in the coast of the tropical area called mangrooves, these plants has really specialized cork cambium that controls not only the water levels but also the salt levels into the plant.

The cork cambium is really important because protects and regulates the plant and its environment.

4 0
3 years ago
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