Sharks are osmoconformers that maintain osmolarity with the saltwater but keep ion concentrations similar to osmoregulators. To do this they must use non-ions to osmoregulate, such as urea. As such sharks take on excess ions from the water because their bodies are at a significantly lower ion level than saltwater. How are the excess ions eliminated?
A. diffusion across the gills
B. active transport across the gills
C. Rectal gland
D. none of the answers
C. Rectal gland
Biology & Microbiology
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Which body region is composed of cartilage?
a. nose b. outer ear c. windpipe d. embryonic skeleton e. all of these
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Which of the following components is not a surface barrier serving as the first line of defense?
What will be an ideal response?
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In the open ocean, concentrations of oxygen reach a minimum value of 500-1000 m, a region referred to as the oxygen ________
Fill in the blank(s) with correct word
Biology & Microbiology
Visible light has a wavelength range of
A. 200-400 nanometers. B. 200-740 nanometers. C. 400-740 nanometers. D. 0.001-100,000 nanometers. E. 200-800 nanometers.
Biology & Microbiology