_____ benefit(s) living organisms by absorbing most ultraviolet (UV) radiation from incoming sunlight
a. The ozone layer
b. Nitrogen
c. Carbon dioxide
d. Chlorofluorocarbons
e. Sulfur oxides
a
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In meiosis, homologous chromosomes are separated during _____
A) anaphase II B) prophase I C) mitosis D) anaphase I
The simplest structure shared among all living organisms is the
A. gut. B. cell. C. photosynthetic chloroplast. D. community. E. nucleus.
Prior to 1972, a pesticide called DDT was used widely in the United States, but was found to pose risks to human health and wildlife. It was found that DDT contaminated the waterways. Where would the concentration of the nonpolar pesticide been the highest?
A. a seagull B. a mosquito larva C. plankton D. algae E. a minnow
By weight, the bulk of a plant's organic material is derived from:
a) atmospheric nitrogen. b) soil minerals. c) carbon dioxide. d) water. e) oxygen.