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Ulleksa [173]
3 years ago
6

_______ are thought to have been present before vertebrates.

Biology
1 answer:
Zina [86]3 years ago
5 0

Answer:

Explanation:

i m not confirmed but i think hag fishes are present before vertebrates

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Answer: Option A) Parathyroid glands

Explanation:

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This hormone helps to raise the levels of calcium ions in the body, by preventing the loss of calcium ions through urine, and also preventing excess deposit of calcium ions in the bone, thus regulating bone density.

6 0
4 years ago
Match the part of the cell to its correct function.
s344n2d4d5 [400]
1. k
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5 0
3 years ago
Put the following in the correct order from smallest (#1) to largest (9)
kobusy [5.1K]

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atom

Explanation:

3 0
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The main food sources of the birds( the plentiful recourses within the environment occupied by the species)
3 0
4 years ago
The question is on the attachment
Helga [31]

Answer:

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