In a tide pool, a student encounters an organism with a hard outer covering that contains much calcium carbonate, an open circulatory system, and gills. The organism could potentially be a crab, a shrimp, a barnacle, or a bivalve. The presence of which of
A) a mantle
B) a heart
C) a body cavity
D) a filter-feeding apparatus
E) eyes
Answer: A
Biology & Microbiology
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What characteristic would the R groups of amino acids have if they are located within the interior of biological membranes?
A. The R groups would be able to form ionic bonds. B. The R groups would be polar. C. The R groups would hydrophobic. D. The R groups would be hydrophilic.
Biology & Microbiology
Eyelids form and eyes open during which month of human development?
a. first month b. third month c. fifth month d. seventh month e. ninth month
Biology & Microbiology
Endochondral ossification step 4
What will be an ideal response?
Biology & Microbiology
The oldest microfossils are of
A. pollen grains. B. insects. C. eukaryotes. D. prokaryotes. E. small animals.
Biology & Microbiology