Gastrulation produces
a. hollow balls of cells.
b. embryos with germ layers.
c. solid balls of cells.
d. maternal messages.
e. yolk.
B
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Th17 cells are important in the first stages of the adaptive immune response
Indicate whether the statement is true or false.
Herbivores belong to which group in a food web?
A. secondary consumers B. primary producers C. tertiary consumers D. primary consumers E. decomposers
A theory differs from a hypothesis in that a theory
A. has predictive power for similar phenomena that haven't been observed yet. B. has more supportive research evidence than a hypothesis. C. All of the answer choices are correct. D. ties together many existing observations. E. is broader in scope than a hypothesis.
The part of the brain that controls the basic responses necessary to maintain life (such as breathing and heartbeat) is
the ____. a. medulla oblongata b. corpus callosum c. pineal gland d. cerebellum e. cerebral cortex