Increased carbon dioxide concentrations may contribute to
a. ozone depletion.
b. global warming.
c. eutrophication.
d. groundwater contamination.
e. biomagnification.
B; Carbon dioxide traps heat in the atmosphere. Therefore, it probably contributes to global warming.
You might also like to view...
Which of the following is (are) NOT a factor(s) that
explain(s) the area effect on island diversity? a. Larger islands have more habitats. b. Smaller islands have more varied and higher elevations. c. Larger islands intercept more colonizers. d. Smaller islands have less complex topography. e. All of these are not factors.
An organism that is eukaryotic is by definition:a
is a protist b. is unicellular c. possesses a nucleus d. possesses organ systems e. belongs to domain Bacteria
Some antibiotics used to treat bacterial infections kill the bacteria by chemically punching holes in the cell wall of the bacteria, by preventing the bacteria from replicating their DNA, or by many other actions that ultimately cause cell death. Why do these antibiotics not work to kill viruses and cure people of viral infections?
a. Antibiotics cannot kill a virus because viruses are not living cells with cell walls to puncture, nor do they have their own organelles to replicate DNA. b. Viruses are just too virulent to be killed by those antibiotics. c. Viruses are too quick for the antibiotics to work. d. Viruses mutate at a rate faster than the rate at which antibiotics can work to kill them.
Approximately what percentage of substances found by the Ames test to be mutagenic are also carcinogenic in animals?
A. 100% B. 90% C. 45% D. 10%