Male hummingbirds flash a patch of iridescent feathers on their neck called the gorget. This behavior makes them very visible. Why advertise their presence to a predator?
A. Predators cannot see colors so are not alerted.
B. Hummingbirds are so fast that predation is not a large factor for them.
C. The benefits of defending a territory exceed the costs of predation.
D. This is an example of a maladaptive behavior that decreases overall fitness.
Answer: C
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Which of the following is not true about yeast?
A. Yeast are larger than most bacteria. B. Yeast possess eukaryotic organelles. C. Yeast reproduce either asexually by budding or sexually through spore formation. D. Yeast contain two or more nuclei.
How do pancake tortoises protect themselves from predators?
a. Their coloration serves as a disguise. b. They emit an undesirable scent. c. They have large jaws with teeth. d. They puff themselves up and become wedged in between cracks in rocks. e. They retreat into their shell.
Cilia lining the respiratory tubes beat mucus upward in order to:
a. moisten the bronchioles. b. conduct the mucus that contains particles to the pharynx and away from the lungs. c. provide mucus to the lungs to prevent them from dehydrating. d. lubricate the throat for easier swallowing. e. promote gas exchange by providing mucus for the respiratory surfaces.
Releases hormones that control blood sugar levels by stimulating glycogen formation or breakdown
(A) testis (B) Lining of small intestine (C) Anterior pituitary (D) thyroid (E) pancreas