Crossing a zebra with a horse produces sterile offspring. This is an example of
A) temporal isolation.
B) hybrid inviability.
C) hybrid infertility.
D) hybrid vigor.
E) gametic incompatibility.
C
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As cleavage divisions continue, the ball or layer hollows out to form the ____
a. morula b. zygote c. blastomere d. blastula e. gastrula
What age group on a population pyramid would you examine to predict the population in 25 years?
A. 0-5 B. 10-15 C. 20-25 D. 25-30
Which of the following is NOT true about sponges?
a. They have few predators or pathogens. b. Some groups have sharp spicules of silica or calcium carbonate. c. Some species secrete a slimy body coating. d. They can harvest sea anemone nematocysts and use them for their own defense. e. Disease and overharvesting have caused population declines.
Within an ecosystem, plants are known as producers or ____
a. heterotrophs b. consumers c. “other feeders” d. decomposers e. autotrophs