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melamori03 [73]
3 years ago
12

Please help for test due today

Biology
1 answer:
Darina [25.2K]3 years ago
4 0

Answer:

a

Explanation:

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Which phylum has members that secrete a hard, calcium carbonate shell?
otez555 [7]

Answer:

i believe your answer would be Mollusca.

Explanation:

(i looked it up on britannica if you have any questions.) Mollusk, also spelled mollusc, any soft-bodied invertebrate of the phylum Mollusca, usually wholly or partly enclosed in a calcium carbonate shell secreted by a soft mantle covering the body.

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1. For a mutation to affect evolution, it must:?
Bezzdna [24]

Answer:

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What do the testes and ovaries produce to develop male and female characteristics?
il63 [147K]

Answer:

Testes and ovaries produce  two types of hormones:

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Explanation:

In testicular tissue, Leydig cells produce androgen hormones: androsterone and testosterone. The ovaries produce a group of estrogen hormones and progesterone. These hormones exert their effect at puberty when the glands are activated. At puberty, the pituitary gonadostimulins activate the sex glands, whose activity leads to the development of secondary sex characteristics (the appearance of first menstruation in girls, beards and mustaches in boys, etc.).

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Is this the correct answer?
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