Scientists hypothesize that a major factor promoting the adaptive radiation of mammals was probably
A) their development of fur.
B) the mass extinction of most dinosaurs.
C) internal fertilization.
D) the origin and diversification of flowering plants.
Answer: B
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A pyrimidine or purine base that has been joined with a ribose or deoxyribose sugar moiety is now termed a ________.
Fill in the blank(s) with the appropriate word(s).
What is the foramen of Panizza?
a. the third chamber of a fish heart that separates into two major arteries b. the hindmost heart in arthropods that propels hemolymph forward c. the hole between crocodilian ventricles that allows blood to pass between d. the web-like capillary structure in gills that allows gas exchange with water
Before Title IX was enforced, one myth that authorities embraced about women’s participation in competitive sports was that
a. Soviet women's gender had to be verified clinically b. their marriageability would be jeopardized c. black athletes were superior to white athletes d. There reproductive organs would be harmed
Proteins that speed metabolic reactions might have
first formed when reactants could have begun interacting inside tiny holes in rocks near deep-sea __________. Fill in the blank(s) with the appropriate word(s).