In studying fossils, biologists found an insect in a layer of clay, a flower in a layer of sand, a fish in a layer of mud, a reptile in a layer of clay, and a bird in a layer of rock. The insect probably lived at the same time as the
A. fish.
B. bird.
C. flower.
D. reptile.
D. reptile.
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In the basic Lotka-Volterra equations that describe predator-prey interactions, the growth rate of the prey population (dNprey/dt) is zero when the density of predators (Nprey) is equal to
A) r/N. B) N/r. C) r/c. D) c/r.
Identify the features unique to protostome development.
A. Coelom forms by a splitting of the mesoderm, the blastopore becomes the anus, and the cleavage is spiral. B. Coelom forms by a splitting of the mesoderm, the blastopore becomes the mouth, and the cleavage is spiral. C. Coelom forms by a splitting of the mesoderm, the blastopore becomes the mouth, and the cleavage is radial. D. None of the features listed are unique to the protostomes.
In species that reproduce via external fertilization:
a. males do not have to compete with each other for access to a female's eggs b. only females provide parental investment, in the form of the nutrition present in the egg c. sexual selection does not operate d. sperm and egg encounter each other outside of the female's body, typically in an aquatic environment e. none of these
Marathon runners are long-distance runners (marathons are races that are 26.2 miles long). Studies have shown that the muscles of marathon runners contain an abundance of slow-twitch muscle cells. Which of the following statements about these fibers is
true? A) Slow-twitch fibers have lots of mitochondria to make ATP aerobically. B) Slow-twitch fibers have lots of mitochondria to make ATP through fermentation. C) Slow-twitch fibers have few mitochondria and make ATP aerobically. D) Slow-twitch fibers have few mitochondria and make ATP through fermentation.