A soft body usually enclosed by a hard shell is a characteristic of some
A. mollusks.
B. arthropods.
C. insects.
D. vertebrates.
A. mollusks.
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During gastrulation, _____
A) the neural tube forms B) the blastula forms C) somites form D) three germ layers form
Dinoflagellates became photosynthetic via secondary endosymbiosis
Indicate whether the statement is true or false.
In order for the theory of common descent and the theory of natural selection to both be supported, what can we infer about the genetic material for all life?
A) It must change very rarely. B) It must vary spontaneously and randomly. C) It must be transferable between adults. D) It must be transferable between different species.
Which of the following acts as a carbon source within the carbon cycle?
A. photosynthesis by plants B. the harvesting of fossil fuel from within the earth C. release of carbon dioxide into the air by the ocean D. respiration from humans and animals