Allopatric speciation occurs because a population
A. merges with another population of the same species.
B. becomes geographically isolated and undergoes genetic change.
C. becomes extinct and is replaced by a population of a different species.
D. shows no genetic change from generation to generation.
E. hybrid sterility occurs.
B. becomes geographically isolated and undergoes genetic change.
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Which of the following best explains why "carbs" (carbohydrates) are advertised by manufacturers of candy bars and sports drinks as a "quick energy boost"?
A) The energy in them can be stored as fat, which has high energy per unit weight. B) The carbons in carbohydrates are rich in energy because they are highly oxidized. C) Carbohydrates are reduced molecules that have high-energy electrons. D) This is an advertising gimmick that has no scientific evidence to support it.
In Drosophila embryos, the anterior compartment of a segment overlaps with the posterior compartment of a parasegment
Indicate whether the statement is true or false
Vertebrates have which of the following
characteristics? a. endoskeleton b. vertebral column c. well-developed organs d. larger brains e. all of these
What structures cushion the embryo during development and allow it to be provided with nourishment and exchange wastes?