These two different lifestyles are an example of a __________
a. resource
b. tradeoff
c. habitat
d. constraint
B
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The visceral mass of molluscs does not contain the
a. circulatory system. b. excretory system. c. nervous system. d. head-foot. e. digestive system.
Identify which compound has been reduced: XH2 + NAD+ ? X + NADH + H+
a. XH2 b. NAD+ c. X d. NADH e. H+
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.
The breathing rate is controlled by chemoreceptors that detect
Select one: a. levels of oxygen in the alveolar air space. b. levels of oxygen in the blood. c. levels of carbon dioxide in the alveolar air space. d. levels of carbon dioxide in the blood. e. level of stretching of the rib muscles and diaphragm.