Which feature do bryophytes and flowering plants have in common?
1.flagellated sperm that must swim through water to reach eggs
2.a complex vascular system
3.both asexual and sexual reproduction
4.some cells contain lignin as a strengthener
3
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The most common type of virus leading to rhinitis is ________.
A. retrovirus B. coronavirus C. herpes simplex virus D. adenovirus E. rhinovirus
According to the _____, modern humans originated in, and migrated out of, East Africa
a. haplotype data of mitochondrial DNA sequences b. haplotype data of Y chromosome sequences c. out-of-Africa model d. multiregional model e. fossil record
What is the hormone that promotes cell elongation by changing plant cell walls so they can expand due
to the force of turgor pressure? a. abscisic acid b. auxin c. cytokinin d. ethylene e. gibberellin
Which process represents a step in the nitrogen cycle?
A) Nitrogen-fixing bacteria convert atmospheric nitrogen to nitrates. B) Nitrites bind to soil particles. C) Nitrogen-fixing bacteria convert atmospheric nitrogen to ammonia. D) Denitrifiers convert ammonium to atmospheric nitrogen.