The longer two species have been evolving on their own, the greater the number of _____ that accumulate between them
a) genetic difference
b) homologous structures
c) convergences
d) DNA bases
e) genetic similarities
Answer: a) genetic difference
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Implantation occurs at which stage of human
pregnancy? a. zygote b. early cleavage c. blastocyst d. gastrula e. morulav
"Brush border" refers to ________ found on the surface of the epithelial cells of the small intestine
Fill in the blank(s) with correct word
Thalidomide, now banned for use as a sedative in pregnancy, was used in the early 1960s by many women in their first trimester of pregnancy
Some of these women gave birth to children with arm and leg deformities, suggesting that the drug most likely influenced _____. A) early cleavage divisions B) differentiation of bone tissue C) morphogenesis D) organogenesis
The loops of Henle in the kidneys of a desert kangaroo rat are much longer than those in a white laboratory rat because the __________.
a. kangaroo rat is adapted to living in an environment where water is scarce b. white rat's diet is much less varied than the kangaroo rat's diet c. kangaroo rat cannot always find food d. kangaroo rat produces more body wastes e. kangaroo rat has less stress and lower blood pressure