Researchers find support in the __________
hypothesis to explain the mass extinction of nearly
all remaining dinosaurs.
a. adaptive radiation
b. endosymbiosis
c. K-T Asteroid hypothesis
d. molecular clock
e. continental drift
Answer: c
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A) mesophiles B) psychrophiles C) thermophiles D) extreme thermophiles E) psychrotrophs
What is the most common way of introducing novel genotypic and phenotypic variants into a population?
a. gene flow b. genetic drift c. mutation d. natural selection
Which one of the following types of cancer kills the highest percentage of people diagnosed with the condition?
A) lung B) breast C) prostate D) skin E) colon
Photosynthesis occurs in which type of plant tissue?
A) parenchyma B) vascular cambium C) epidermal tissue D) collenchyma