Laminaria is the genus of kelp that dominates in:
a. the Pacific coast.
b. the South Atlantic.
c. the Tropical Pacific.
d. the North Atlantic.
e. the Indian Ocean.
D
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The bond in table salt (NaCl) is
a. polar. b. ionic. c. covalent. d. double. e. nonpolar
An intrauterine device works to prevent pregnancy by _____
a. changing the pH of the uterus so sperm cannot live b. changing the chemistry of the uterus so sperm cannot live c. interfering with sperm movement or implantation d. killing sperm e. preventing ovulation
The gut cavity may be a fully lined coelom or a partially lined __________. Fill in the blank(s) with the appropriate word(s)
Plant species regularly hybridize in nature, but only some crosses result in new polyploid species. Of the crosses below, if each one occurred, which would be most likely to result in a new stable polyploid species?
A. A cross between a species with a CC genome and a species with a DD genome, forming a hybrid with a CD genome. B. A cross between a species with a BB genome and a species with a DD genome, followed by a doubling of chromosomes, forming a hybrid with a BBDD genome. C. A cross between a 4n gamete and a 1n gamete, forming a 5n hybrid. D. A cross between a 2n gamete and a 1n gamete, forming a 3n hybrid.