A joint that is movable in only two dimensions, such as the elbow, is called a ________ joint
Fill in the blank(s) with correct word
hinge
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The energy base on mud flats is:
a. phytoplankton. b. detritus. c. marsh plants. d. algae. e. chemosynthesis.
During puberty, the increased production of testosterone in males causes the rapid enlargement of which one of the following structures of the respiratory system?
A) pharynx B) esophagus C) larynx D) bronchi E) bronchioles
Stomatal guard cells swell to create a stomata in response to ________.
A. The loss of Na+ and Cl- ions, allowing water to flow into the cells by osmosis B. The active transport of water into stomatal guard cells C. The outward flow of K+ ions, causing water to flow out of the cells by osmosis D. The inward flow of K+ ions, causing water to flow into the cells by osmosis E. Wilting in the leaf, which stimulates the uptake of water by stomatal guard cells
Which of the following processes contributes least to genetic diversity?
A) crossing over B) duplication of DNA C) independent assortment of chromosomes at the metaphase plate D) combining of gametes from two different individuals