Uterine implantation due to enzymatic digestion of the endometrium is initiated by the _____
A) inner cell mass
B) endoderm
C) mesoderm
D) trophoblast
D
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Where would you expect to find tight junctions?
A) in the epithelium of an animal's stomach B) between the smooth endoplasmic reticulum and the rough endoplasmic reticulum C) between plant cells in a woody plant D) in the plasma membrane of prokaryotes
According to Oparin's theory, primitive Earth's atmosphere must have lacked
A. oxygen. B. hydrogen. C. water. D. nitrogen.
Which term best explains the notable differences in tooth size and shape for the two evolutionarily related species, the aardwolf and the spotted hyena?
a. convergence b. development c. exaptation d. divergence
________ are soil dwellers; ________ are mostly marine; and ________ mostly inhabit fresh water
A) Earthworms; leeches; annelids B) Earthworms; leeches; polychaetes C) Earthworms; polychaetes; leeches D) Polychaetes; earthworms; leeches