Which factor is the primary control of productivity in aquatic systems?
A) temperature
B) precipitation
C) light
D) salinity
C
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Which of the following statements is the most accurate description of fruits and seeds?
A. "Fruits" and "seeds" are synonymous terms. B. Fruits always have fleshy coverings, while those of seeds are always hard. C. Fruits are structures that contain seeds and foster seed dispersal. D. Fruits contain endosperm but seeds do not. E. Fruits are produced only by angiosperms and seeds are produced exclusively by gymnosperms.
Fred Griffith's experiment, in which he used two strains of Streptococcus pneumoniae, demonstrated that _____
a. pathogenic bacteria function differently in mice than in other organisms b. harmless bacteria can become transformed into disease-causing bacteria by a bacteria transformation factor c. pure DNA extracted from disease-causing bacteria transformed harmless strains into killer strains d. dead cells lose their genetic information e. DNA is a protein rich in nitrogen and phosphorus
The first vertebrates appear in the fossil record during the
A. Cambrian Period. B. Carboniferous Period. C. Triassic Period. D. Devonian Period. E. Proterozoic Era.
The process by which parents produce offspring is called:
a. reproduction. b. homeostasis. c. compensation. d. feeding. e. artificial selection.