In humans, the allantois:a
stores embryonic nitrogenous wastes.
b. eliminates nitrogenous wastes from the embryo.
c. contributes to the formation of the blood vessels in the umbilical cord.
d. secretes amniotic fluid.
e. serves as a temporary center for formation of blood cells
c
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The coelacanth (Latimeria) is ________
a. an Australian lungfish b. an extinct lobe-finned fish c. the only living lobe-finned fish d. an early amphibian
One hypothesis concerning the origin of the abiotic
synthesis of proteins holds that these proteins formed on and were bound and protected by a. oceanic stratified mica crystals. b. clay compounds in tidal flats. c. sediments in the oceans. d. oceanic metal ores. e. none of these.
A nucleic acid contains uracil, allowing you to conclude that
A. this nucleic acid could be either DNA or RNA. B. this nucleic acid is RNA. C. this nucleic acid is DNA.
The vaginal microbiome varies in relationship to the menstrual cycle. The diversity is ________ related to estradiol production
a. directly b. inversely c. conversely d. not