In vertebrates, which of the following endocrine organs serves as the first intermediary between the brain (which perceives sensory stimuli) and the rest of the endocrine system?
A. the hypothalamus
B. the thyroid gland
C. the anterior pituitary gland
D. the posterior pituitary gland
E. the adrenal glands
A
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In the annual rings of woody trees, how does the cell size within the xylem of the spring and summer wood compare to the fall and winter wood?
A. It is more dense. B. It has smaller vessels. C. The cell walls are thicker. D. It is younger. E. The cells are larger.
The structure that is covered with cilia is labeled
a. 1. b. 2. c. 3. d. 4. e. 5.
Which physical feature makes it possible for amniotes to be completely terrestrial?
a. their skin b. their lungs c. their eggs d. their four limbs e. their brains
A wolf that feeds on moose and elk would be classified within which trophic level?
A. Secondary carnivore B. Primary producer C. Primary carnivore D. Decomposer E. Detritivore