________ are plasmids that contain genes for resistance to a drug.
Fill in the blank(s) with the appropriate word(s).
R factors
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An oak tree can support hundreds of beetles, caterpillars and other primary consumers. This is an example of
A. a pyramid of biomass. B. excessive levels of primary production. C. an unusually diverse group of primary consumers. D. primary parasitism. E. an inverted pyramid.
Deforestation in areas like Madagascar can significantly affect the water cycle. Why is this?
A. Less moisture is transpired into the atmosphere after deforestation. B. It is more difficult for soil nutrients to leach into streams after deforestation. C. The rate of evapotranspiration increases after deforestation. D. Cloud cover will increase after deforestation.
The problem with plastic garbage is that it ________
a. can go from storm drains to the sea only b. can harm birds and mammals when consumed only c. can last for hundreds of years in the ecosystem only d. all of the choices
The half-life of 14C is 5,730 years. If you test a fossilized bone and find that it has 1/8th the 14C as a modern bone, you could conclude that it is approximately years old.
A. 5,730 × 3 = 17,190 B. 5,730 × 2 = 11,460 C. 5,730 × 1 = 5,730 D. 5,730 / 8 = 716 E. 5,730 × 8 = 42,960