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Solnce55 [7]
3 years ago
9

Which of the following describes the embryonic period

Biology
1 answer:
dangina [55]3 years ago
8 0

There should be options for this question. I manged to find them elsewhere. They are:

A) the period during which tremendous growth occurs and the organs continue to develop and become  functional

B) the period during which the umbilical cord develops

C) the period during which the major organs and structures of the organism first develop

D) the period during which the zygote moves down to the uterus and begins to implant in the lining

The correct answer is C. The embryonic period is the period during which the major organs and structures of the organism first develop. The embryonic period lasts from implantation of the egg in the uterus until about 8 weeks from the time of conception. It is the second major stage of prenatal development, prior to embryonic is the germinal stage and lastly is the fetal stage.

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Which molecule prevents a muscle contraction from occurring when the muscle is at rest?
AysviL [449]

Troponin-tropomyosin molecules prevents a muscle contraction from occurring when the muscle is at rest.

<h3>What is muscle contraction?</h3>

The activation of tension-producing regions within muscle cells results in muscular contraction. Because muscle tension can be created without changes in muscle length, such as when holding something heavy in the same position, muscle contraction does not always imply muscle shortening in physiology. Muscle relaxation, or the return of the muscular fibers to their low tension-generating state, occurs after a muscle contraction has finished.

Both length and tension can be used to characterize muscle contractions. If the muscle tension varies but the muscle length doesn't, the muscle contraction is said to be isometric. A muscle contraction is isotonic, however, if the tension in the muscle remains constant during the contraction.

To learn more about muscle contraction with the help of given link:

brainly.com/question/10115123

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5 0
1 year ago
When Charles Darwin considered wings of birds, he famously propose 1 ): Google. hhmi biointeractive great transition heime 17:28
serg [7]

When Charles Darwin considered wings of birds, apart from his famous proposal he also predicted that fossils will be found with structures that are intermediate between early and modern form.

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<u>Explanation:</u>

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Since we don’t have enough record of the fossils, it is very difficult to know the accuracy of transitional fossil.  However, we do have some record of fossils from which we can gather enough evidence of how the fossils where earlier and how it evolved over a period of time.  

7 0
2 years ago
Did you diagram all the faults and folds correctly? Which fault and/or fold did you find most difficult to diagram? Explain why.
Vikentia [17]

Answer:

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7 0
3 years ago
Grassland ecosystems receive very little precipitation. The predominant plants are grasses, and drought and wildfire are common.
elixir [45]
Hi hope I can help, I think the answer isB
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A cell with a diploid number of 24 undergoes meiosis, how many chromosomes are in each daughter cell?
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