Sporopollenin is
A. a tough protective covering on spores.
B. pollen that is produced in a sporophyte.
C. the conversion of pollen to spores.
D. a capsule housing pollen.
E. food stored in pollen for the growing embryo.
A. a tough protective covering on spores.
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Atoms of a single element that possess different numbers of neutrons are called:
A. isomers. B. polymers. C. ions. D. isotopes. E. monomers.
Which of the following is true concerning
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Which of the following events is (are) related to the
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