An __________ species is one that is especially sensitive to environmental change and can be
monitored to determine the health of an ecosystem. Fill in the blank(s) with the appropriate word(s).
indicator
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When muscles combine to produce similar motions, they are called:
A. agonists. B. antagonists. C. flexors. D. extensors. E. isometric.
A simple goiter is an enlarged form of which gland?
a. adrenal b. pancreas c. thyroid d. parathyroid e. thymus
The HPA axis is a stress response that consists of three steps: (i) secretion of (A)____ from the hypothalamus, (ii) secretion of (B)_____ from the pituitary, and (iii) secretion of (C)_____from the adrenal cortex.
a. (A) ACTH (B) CRH (C) cortisol b. (A) cortisol (B) CRH (C) ACTH c. (A) CRH (B) ACTH, (C) cortisol d. (A) cortisol (B) ACTH (C) CRH e. (A) ACTH (B) cortisol (C) CRH
Two species of frogs belonging to the same genus occasionally mate, but the offspring do not complete development. What is the mechanism for keeping the two frog species separate?
A) the postzygotic barrier called hybrid inviability B) the postzygotic barrier called hybrid breakdown C) the prezygotic barrier called hybrid sterility D) gametic isolation E) adaptation