The leading cause of current species extinctions is
A) global warming.
B) habitat destruction.
C) hunting.
D) diseases.
B
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The endodermis
(a) is the outer covering of the root. (b) is part of the vascular tissue. (c) contains the Casparian strip, which regulates the movement of substances. (d) is none of the above.
In a pond, tadpoles eat algae and fish eat the tadpoles. Above the pond, grasshoppers eat grass and, at night, are preyed upon by bats. Other bats eat the fish that eat the tadpoles. In this community, the tadpoles are:
A. primary producers. B. primary consumers. C. secondary consumers. D. tertiary consumers. E. detritivores.
Why was it initially expected that cloned animals might have a shorter life span?
a) The egg cell had elevated telomerase. b) The chromosomes of the donor nuclei had lengthened telomeres. c) The donor cell had elevated telomerase. d) The chromosomes of the donor nuclei had shortened telomeres.
Which of the following functional forms will be the most restrictive in terms of the shape of the resulting interpolation of data gaps in a sample data set?
A. Linear B. Cubic C. Quadratic D. Piecewise linear