An organism can exchange matter and energy with its surroundings. Thus, any change in an organism's
energy content must be balanced by a corresponding change in the energy content of the surroundings.
As such, an organism is referred to as:
a. a closed system.
b. an open system.
c. a dynamic system.
d. a thermally reactive system.
e. a potential system
B
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How many major branches are there on the evolutionary tree of life?
A. one B. two C. three D. six E. 12
If blood transports hormones throughout the body, how do they communicate with specific targets?
A. Special gateway valves in the blood vessels direct hormones to their target tissues. B. Special carrier proteins "walk" along microtubule tracts to deliver the hormones to their targets. C. Axonal pathfinding mediates the delivery of hormones to their specific targets. D. Only target tissues have receptors that allow them to receive the signal. Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about hormones? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Molting in arthropods may involve a change in all
but a. body form and maturity. b. sex. c. body size. d. eating habits. e. sensory structures
A creature that does NOT have an endoskeleton is the
A. beetle. B. crocodile. C. sea sponge. D. starfish. E. shark.