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Dmitrij [34]
2 years ago
15

Hair has a medulla region that is variable. Describe the possible variations

Biology
1 answer:
e-lub [12.9K]2 years ago
8 0

Answer:

3 types I think

Explanation:

Continuous, Fragmented and absent.

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8 0
2 years ago
Features that are homologous are similar due to __________.
kkurt [141]

<span>The answer is shared an evolutionary history. Homologous structures evolved from the same ancestor structure. An example of homologous features is the four limbs of all tetrapods. In birds, the forelimbs evolved into wings while in crocodiles they still used for walking, and in humans, they evolved into hands. </span>






3 0
3 years ago
Steroid hormones and thyroid hormones ________ pass across the plasma membrane; they cause the target cells to ________ that pro
tekilochka [14]

Answer:

can ,synthesize specific proteins

Explanation:

Hormones are chemical signals secreted by animals and plant that are capable of regulating body activities and maintain homeostasis.

They are transported in the circulatory system of the body

The action of hormones can be seen after the hormone has bound to its specific receptor found inside the cell.

For instance, steroid hormone and the thyroid hormones can pass through the plasma membrane to their receptors inside the cells.

When they bind with their receptors, the target cells will synthesize specific proteins that produce the characteristic effect of the hormone.

6 0
3 years ago
Given a parent genotype of hh, what are the possible gametes that they can produce?<br> :)
Yuri [45]

Answer:

For hh, the gametes can only carry h (the recessive allele). For both heterozygous individuals (Hh), the gametes can carry the H (dominant allele) or the h (recessive allele). For Hh, the gametes can carry the H (dominant allele) or the h (recessive allele). For HH, the gametes can only carry H (the dominant allele).

Explanation:

hope it help

3 0
2 years ago
since the parasympathetic division causes the heart rate to ____________ and the sympathetic division causes the heart rate to _
Oduvanchick [21]

Answer:

since the parasympathetic divison causes the heart rate to decrease and the sympathetic divison causes the heart rate to increase this is an example of antagonistic innervation

Explanation:

7 0
2 years ago
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