External fertilization is common in most
a. insects.
b. amniotes.
c. lizards.
d. bony fish.
e. bony fish and insects
D
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In the DNA of certain bacterial cells, 16% of the nucleotides are adenine. What are the percentages of the other nucleotides in the bacterial DNA?
A. 16% thymidine, 34% guanine, 34% cytosine B. 34% uracil, 16% guanine, 16% cytosine C. 34% thymidine, 34% guanine, 16% cytosine D. 34% thymidine, 16% guanine, 34% cytosine
Which endocrine gland is the main center for
control of the internal environment? a. pineal and thymus b. hypothalamus c. thyroid and parathyroids d. adrenal cortex and adrenal medulla e. pancreas and gonads
Describe how tumor-suppressor genes keep cells in check
What will be an ideal response?
Which of the following ethical principles is supported by conservation biology?