The placenta develops from the endometrium while the fetus develops from embryonic tissue.
Answer the following statement true (T) or false (F)
False
Shortly after implantation, newly developing embryonic tissues merge with the endometrium to form the placenta. The placenta, therefore, has a maternal portion and a fetal portion. The fetus itself does develop entirely from embryonic tissue.
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A type of transport of a solute across a membrane, up its concentration gradient, using protein carriers driven by the expenditure of chemical energy is known as
A. osmosis. B. diffusion. C. facilitated transport. D. active transport. E. exocytosis.
If the groups we recognize as different human races represented genetically isolated populations, we would expect to see (select all that apply):
A. more genetic variation between groups than we see within groups. B. more genetic variation within groups than we see between groups. C. no clear pattern of genetic variationin some regions, we would see more variation within than among groups, and in some regions we would see the opposite. D. a correlation between the amount of genetic variation between groups and the length of time the groups have been isolated from one another. E. None of the above.
The most important evidence that Darwin used to develop his theory of natural selection came from ____
a. the Argentine pampas b. his boyhood neighborhood in England c. the Galápagos Islands d. Australia and New Zealand
e. South AmericaAn exponential growth curve looks like ________________
A. a curved line that increases more and more steeply over time B. a curved line that increases steeply at first and then levels out and stops increasing C. an increasing straight line D. a complete circle E. a series of large peaks and valleys