How would ecological efficiency change if all humans became vegetarians?
What will be an ideal response?
ANSWER: Since energy is lost at each trophic level, we would conserve more energy by consuming
plants directly. By including another trophic level (an herbivore) or even two more trophic
levels (an herbivore and a carnivore), more energy is lost and thus, efficiency is
compromised.
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Regulation of sodium and potassium levels are the function of the ____________
Fill in the blank(s) with the appropriate word(s).
In the absence of predators, what do you think was the main selection factor affecting the average number of spots on male guppies?
a. an infectious disease that influenced pigment deposition in guppy integument b. sexual selection by females for males with high spot numbers c. a completely random process d. none of the above
This illustration shows that after two half-lives,
__________ percent of the parent radioisotope has decayed. a. 100 b. 75 c. 50 d. 25 e. 0
For most animal embryos, what is the name of the initial opening between the developing gut and the outside environment?
a. mesoglea b. blastopore c. schizocoelom d. archenteron