Freshwater lakes in temperate regions will turn over
in the
a. fall.
b. winter.
c. spring.
d. summer.
e. fall and spring.
Answer: e
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A. charophyte B. fern C. green alga Chlamydomonas D. moss E. liverwort
The most prominent organelle in most eukaryotic cells, that contains most of its DNA, is the
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Which of the following hominin species was the first to leave Africa, it's fossils date from 1.9 to 0.2 mya, and it had a similar anatomy to our species?
A. Home floresiensis B. Home erectus C. Sahelanthropus tchadensis D. Australopithecus afarensis
Many commercial pesticides become less effective after two to three years because:
A) the chemicals mutate. B) pests with resistant genes will survive and reproduce. C) new pests invade the area. D) pests without resistant genes will ignore any plant coated with pesticide.