Meiosis results in the generation of
a. four haploid cells.
b. two diploid cells.
c. two diploid cells and two haploid cells.
d. four diploid cells.
e. one haploid and three diploid cells.
A
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During early embryonic development, implantation into the uterine lining occurs at the ____ stage
a. zygote b. morula c. blastocyst d. gastrula e. hypoblast
The process that decreases the number of organisms with phenotypes less fit to meet environmental
challenges is: a. natural selection. b. genetic drift. c. gene flow. d. genetic polymorphism. e. migration.
A sodium-potassium pump _____
A) moves three potassium ions out of a cell and two sodium ions into a cell while producing an ATP for each cycle B) move three sodium ions out of a cell and two potassium ions into a cell while consuming an ATP for each cycle C) moves three potassium ions out of a cell and two sodium ions into a cell while consuming 2 ATP in each cycle D) move three sodium ions out of a cell and two potassium ions into a cell and generates an ATP in each cycle
The accumulation of carbon dioxide, lactic acid, or other cellular waste causes nearby precapillary sphincters to
A) shorten. B) contract. C) lengthen. D) relax.