Unlike other decapods, hermit crabs are covered by a very thin and light exoskeleton that does not confer much protection against predators. How is this a selective advantage for the hermit crabs?
What will be an ideal response?
Hermit crabs do not need a very hard exoskeleton since they utilize the shells of dead gastropods for their protection. This means that the hermit crabs can channel their energy into other metabolic processes rather than expending it on hard exoskeletons.
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Actinoplanetes that dwell in the soil play an important role in plant and animal decomposition.
Answer the following statement true (T) or false (F)
After the blood leaves the glomerular capillaries, it goes via the efferent arterioles to the
a. renal vein. b. renal artery. c. peritubular capillaries. d. vena cava. e. heart.
Mutation is the only evolutionary mechanism that _____
A) does little to change allele frequencies B) is more important in eukaryotes than in prokaryotes C) happens in all populations D) has no effect on genetic variation
The frustules in diatoms are composed of ________, which make(s) them difficult to degrade
a. chitin b. humics c. silica d. polysaccharides