Water flowing over fish gills exchanges gases with blood flowing in the opposite direction inside gill
capillaries. This is called__________. Fill in the blank(s) with the appropriate word(s).
countercurrent exchange
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The interaction of suspension and deposit feeders in muddy areas
a. is an example of mutualism. b. is an example of interference when sediment particles from deposit feeders' activity clogs suspension feeders' ability to feed and exchanges gases. c. demonstrates that deposit feeders can outcompete suspension feeders. d. demonstrates that suspension feeders outcompete deposit feeders. e. is an example of a keystone predator.
The most common and physiologically important auxin is:
a. indoleacetic acid. b. indolebutyric acid. c. naphthaleneacetic acid. d. 2,4-D. e. 2,4,5-T.
Which of the following best describes the relationship between the nucleus and the cytoplasm?
A. The cytoplasm is a fluid that fills the inside of the nucleus B. The nucleus is the fluid and it mixes with the fluid cytoplasm C. The nucleus is an organelle that is surrounded by the cytoplasm D. The cytoplasm is an organelle that is usually found near the nucleus
The upper throat may be referred to as the:
A) epiglottis. B) larynx. C) trachea. D) pharynx.