Which of the following organs of the endocrine system secretes releasing and inhibiting hormones?
a. pituitary gland
b. pancreas
c. hypothalamus
d. adrenal glands
e. thyroid gland
C
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The charges on a water molecule are distributed equally
Indicate whether the statement is true or false
The plants and animals now present on acreage from
which the trees were removed ten years earlier represent a. primary succession. b. a climax forest. c. pioneer species. d. secondary succession. e. species introductions.
The earliest cells were probably autotrophs that made food by photosynthesis
a. true b. false
Your friend claims that phloem always carries sugars down a plant. What, if anything, is wrong with that statement?
a. Phloem can carry sugars down a plant, but it can carry sugars up as well (e.g., if sugars are moving to flowers or fruits). b. Phloem can carry sugars down a plant, but it can also carry sugars to the left or to the right from its location (e.g. sugars can move to leaves). c. The statement is completely true. d. Phloem is responsible for carrying sugars down a plant while xylem carries them up.