Suppose you traveled back in time and located the first animals to have evolved feathers
You found that these animals were tree-dwelling ectotherms, able to run quickly but unable to fly. You also noticed that only males had feathers. Which hypothesis of feather evolution would these data most support? Feathers initially evolved in a role associated with _____.
A) flight
B) insulation
C) sexual selection
D) gliding
Answer: C
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About 4 million years ago, ________ left the African forest to dwell in the grasslands.
A) Dryopithecus B) Aegyptopithecus C) Australopithecus D) Propliopithecus
Light-independent reactions in plants proceed in the ________
a. thylakoid membrane b. plasma membrane c. stroma d. cytoplasm
Chromatids that are attached at the centromere are called what kind of chromatids?
a. mother b. daughter c. sister d. programmed e. either mother or daughter
The gas exchange surfaces in a mammalian lung are organized into structures that look like clusters of hollow grapes. The hollow, grape-like structures are the________.
A. alveoli B. lamellae C. parabronchi D. bronchi E. opercula