Over hundreds of millions of years, high pressure and temperature transformed ____ into deposits of oil and natural
gas.
a. coal
b. land animal remains
c. land plant remains
d. plankton remains
e. sedimentary rock
ANSWER: d
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The pores through which leaves exchange atmospheric gases with leaf cells during photosynthesis are the
A. sieve tube elements. B. guard cells. C. stomata. D. epidermal cells. E. petioles.
The fossil record is incomplete because
a. very few organisms were preserved as fossils. b. organisms tend to decay before becoming a fossil. c. animals with hard parts are preserved more easily. d. geologic processes may destroy fossils. e. all of these are true.
Is it possible for crossing-over to occur between two linked genes, yet for all of the resulting offspring to have parental genotypes?
What will be an ideal response?
Homologous chromosomes recognize one another by their centromeres, move through the cell toward one another, and come to lie next to each other in a process called
A. crossing over. B. synapsis. C. differentiation. D. trisomy.