Seedless vascular plants found in deserts do not require water for sperm to swim to eggs
Indicate whether the statement is true or false.
ANS: F, require
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What kind of bond is formed between complementary base pairs to join the two DNA strands into a double helix?
A) ionic bond B) phosphodiester bond C) hydrogen bond D) disulfide bond E) peptide bond
Unlike a pedigree, a cladogram ______.
a. shows ancestry b. shows hypothesized phylogeny c. indicates ancestry from two parents d. explains relationships
The three stress hormones are _____.
A. cortisol, FSH, and LH B. epinephrine, cortisol, and FSH C. norepinephrine, cortisol, and FSH D. epinephrine, norepinephrine, and cortisol E. epinephrine, norepinephrine, and FSH
Of all the species that have ever lived on Earth, how many have gone extinct?
A. Less than 1% B. About 10% C. About 25% D. About 75% E. About 99%