Which of the following is considered a peptide hormone?

a. estrogen
b. epinephrine
c. thyroxine
d. insulin


d. insulin

Biology & Microbiology

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Which category of animals had the most threatened and endangered species in 2012?

a. birds b. fishes c. insects d. reptiles

Biology & Microbiology

Which respiratory structure will connect the larynx to the bronchi?

a. Bronchial tree b. Pharynx c. Diaphragm d. Epiglottis e. Trachea

Biology & Microbiology

This animal is a tetrapod that has a cloaca,

aquatic larvae, and is tailless as an adult. This animal is

a. a salamander. b. a frog. c. a tunicate. d. a lizard. e. more than one of these.

Biology & Microbiology

Movement of substances that requires the expenditure of ATP molecules is called ____

a. facilitated diffusion b. simple diffusion c. osmosis d. active transport e. bulk flow

Biology & Microbiology