Background extinction is a measure of
a. the rate of species turnover at the end of geological eras.
b. the number of species that suffer extinction at the beginning of geological eras.
c. the steady rate of species turnover within a lineage throughout most of their evolutionary
history.
d. the lowest rate of species turnover within a lineage observed within a geological era.
e. the animals that appear in the dense forest.
C
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Genes with similar sequences in two different species, such as humans and mice
A. produce essentially identical products that have essentially identical functions. B. may produce products that have slightly to dramatically different functions. C. almost always have completely different functions in the two species. D. there is no way of predicting whether the gene will function the same way or differently. E. are nearly always nonfunctional or "nonsense" DNA in one of the species, present only as a transposon.
Which animal is used as an early warning system for encephalitis?
A. armadillos B. mice C. chickens D. foxes
The first person acknowledged to have seen living,
moving cells by using a microscope was a. Robert Hooke. b. Robert Brown. c. Galileo Galilee. d. Rudolf Virchow. e. Anton van Leeuwenhoek.
Natural selection drives evolution through the following forces except
A. competition for food. B. predators. C. climate. D. reproduction. E. competition for mates.