Which of the following are important reproductive adaptations that allow plants to inhabit terrestrial environments?
A) Roots and leaves
B) Flowers and leaves
C) Seeds and pollen
D) Gametophytes and sporophytes
E) Leaves and stems
C
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Marsupials are distinguished by
A. a marsupium. B. mammary glands. C. opposable thumbs. D. nails.
A mutation that affects the genotype of the organism but not the phenotype is called a
a. nonsense mutation. b. missense mutation. c. frameshift mutation. d. silent mutation.
The genetic code is a ________ codon.
Fill in the blank(s) with the appropriate word(s).
Why is it necessary to take special safety precautions when using radioactivity?
A. Radioactive substances will ionize cells. B. Radioactive substances have the potential to cause damage to living cells. C. Radioactive substances decay. D. Radioactive substances will perforate plasma membranes.