Which of the following kinds of animals excrete their nitrogenous waste entirely as ammonia?

A) birds
B) fish
C) land snails
D) insects


Answer: B

Biology & Microbiology

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Gametes with extra or missing chromosomes are the result of

a. fertilization. b. recombination. c. nondisjunction. d. independent assortment.

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A particular carbon isotope has an atomic number of 6 and an atomic mass of 14. The respective number of neutrons, protons, and electrons that this carbon isotope has is _______.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

What was the first substance produced by microorganisms to be used pharmaceutically?

A) penicillin B) streptokinase C) taxol D) human insulin E) interferons

Biology & Microbiology

Most of the phyla of the animal kingdom are of animals that occur

A. in the sky. B. on land. C. in freshwater habitats. D. in the ocean.

Biology & Microbiology