The core of the immune system is made up of
a. red blood cells.
b. platelets.
c. white blood cells.
d. intact skin.
e. intact mucus membranes.
C
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Which of these conditions should completely prevent the occurrence of evolution in a population over time?
a. All phenotypic variation between individuals is due only to environmental factors b. the population lives in a habitat where there are no competing species present c. the population size is large d. The environment is changing at a relatively slow rate
When he arrived at the Galápagos Islands, Darwin did not observe the amazing tool-using "woodpecker finch" that can modify twigs to pry out grubs. Because there are no true woodpeckers on the Galápagos Islands, this behavior allows this finch to exploit an untapped food source. However, not all members of this species exhibit this behavior, which is probably learned from watching other finches. Therefore, which of the following is NOT true?
A) It is probably not "hardwired" in the brain as a behavior passed on genetically. B) Young isolated at hatching will not know how to do this. C) This "learned" behavior will not lead to evolutionary change in the woodpecker population. D) There must be a great advantage to reaching this food source for this learned behavior to be repeated by most descendants each generation.
How many chromosomes should be in a megasporangium nucleus?
A) 8 B) 16 C) 24 D) 32
During the process of ________, aquatic species release large numbers of gametes into the water
Fill in the blank(s) with correct word