Birds and reptiles save water by eliminating __________ rich wastes as uric acid crystals. Fill in the blank(s) with the appropriate word(s)
nitrogen
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Relative dating uses to estimate the age of a fossil.
A. radioactive isotopes B. depth within rock layers C. embryonic structures D. a molecular clock E. structural features
Which of the following can be said to occur during every energy transformation?
a. A change occurs in the free energy of the universe. b. The entropy of the universe increases. c. A change occurs in the total energy of the universe. d. The entropy of the universe decreases.
In __________, the mouth forms from the second opening.
Fill in the blank(s) with the appropriate word(s).
Which of the following does not utilize active transport?
A. concentrating iodine ions in the thyroid gland B. absorbing sugar in the gut C. movement of sodium and potassium in nerve cells D. movement of oxygen from the lungs into the blood E. water homeostasis in the kidneys