Which hypothesis proposes an explanation for the origin of eukaryotic organelles?
a. the endosymbiotic hypothesis
b. the hydrogen hypothesis
c. the origins hypothesis
d. the eukaryotic hypothesis
Answer: A
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A typical amniote has ____, but fish do not
a. a backbone b. waterproof skin c. gills d. external fertilization e. a cartilaginous skeleton
Secondary succession can occur ____
a. after a fire b. on a new sand dune c. on bare rock d. immediately after the formation of an artificial lake e. on a glacier
Stem cells have the ability to differentiate to form specific cell types, which divide only slowly or not at all
a. True b. False
Sound amplification happens in the middle ear because of ________
A) size difference between the eardrum and oval window B) lever action of the ossicles C) resonance in the efferent outer hair cells D) stapedial reflex