Animals that use an exoskeleton for movement include
_____ crustaceans.
_____ cnidarians.
_____ reptiles.
_____ insects.
_____ protists.
__X__ crustaceans.
_____ cnidarians.
_____ reptiles.
__X__ insects.
_____ protists.
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Answer the question using the accompanying figure. Many ____ act via the signaling fashion illustrated by this figure
a. neurohormones b. digestive hormones c. stress hormones d. blood sugar regulatorsc e. growth factors
Explain how the field of human biochemical genetics had its beginnings partly through the persistence of a young
mother. What will be an ideal response?
A person hears a sound coming from a hole in the ground. Sometime later a groundhog is seen emerging from the hole in the ground. The person suspects that the sounds were made by the groundhog. The underlined portion of this story is best described as a(n)
A. experiment. B. hypothesis. C. observation. D. test of a hypothesis.
Carbon, in the form of carbon dioxide (CO2), enters the atmosphere in several ways. Which of the following is NOT a process by which carbon dioxide enters the atmosphere?
A) cellular respiration of plants B) transpiration by plants C) respiration by oxygen-breathing animals D) burning of fossil fuels, such as coal and oil