The process of sexual selection tends to occur when females select a trait in males that
a) is an accurate indicator of fitness, e.g., good, healthy genes.
b) is associated with unhealthy genes.
c) makes them more visible to predators.
d) makes them more likely to die immediately after reproducing.
Answer: c) makes them more visible to predators.
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Only ______ have a lung designed so that air can flow through them in one direction
a. a few fish b. amphibians c. birds d. mammals e. insects
Blood slows down in arterioles due to the large cross-sectional area.
a. true b. false
One purpose of the lymphatic system is to:
a. transport nutrients and oxygen. b. returns interstitial fluid to the blood. c. block the transport of blood proteins. d. produce red blood cells. e. deliver carbon dioxide to the heart.
Hypothesis I: A flavin pigment absorbs blue light; this pigment then activates the proton pump.Hypothesis II: When CO2 concentration rises, a membrane receptor inactivates the proton pump.Stomata do not open when exposed to a narrow band of green light.
A. Supports both hypothesis I and II. B. Supports only hypothesis I. C. Supports only hypothesis II. D. Supports neither hypothesis.