Over evolutionary time, many cave-dwelling organisms have lost their eyes. Tapeworms have lost their digestive systems. Whales have lost their hind limbs. How can natural selection account for these losses?
A. Natural selection cannot account for losses, only for innovations.
B. Natural selection accounts for these losses by the principle of use and disuse.
C. The ancestors of these organisms experienced harmful mutations that forced them to find new habitats that these species had not previously used.
D. Under particular circumstances that persisted for long periods, each of these structures presented greater costs than benefits.
D. Under particular circumstances that persisted for long periods, each of these structures presented greater costs than benefits.
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A digestive cavity in which food enters an opening at one end and passes through the animal in one direction as it is digested is called the
A. gastrovascular cavity. B. stomach. C. alimentary canal. D. epithelial cavity. E. intestine.
Prokaryotes reproduce by ___________, which creates _____ exact daughter cell clone(s) of the original parent cell.
a. trinary fission; three b. sexual fission; one c. binary fission; two
What will always have an equal percentage of A and G, and an equal percentage of C and T?
What will be an ideal response?
The presence of (hyphae/spores/spherules) in a sample from the lungs is diagnostic for coccidioidomycosis
What will be an ideal response?