Which is NOT necessary for sympatric speciation?

a. organisms living together in the same location
b. a common home range
c. geographic barriers
d. existing interbreeding population
e. reproductively mature individuals


Answer: c

Biology & Microbiology

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The eight climographs below show yearly temperature (line graph and left vertical axis) and precipitation (bar graph and right vertical axis) averages for each month for some locations on Earth

Which climograph shows the climate for location 1? A) A B) C C) E D) G E) H

Biology & Microbiology

Supertasters for the chemical PTC are ____ for the trait

a. homozygous dominant b. heterozygous c. homozygous recessive d. either homozygous dominant or homozygous recessive e. either homozygous dominant or heterozygous

Biology & Microbiology

You suspect that your roommate may be abusing drugs. He exhibits the following symptoms: aggressiveness, bursts of extreme energy followed by "crash" periods, and delusions. Which drug may be responsible?

A) amphetamines B) LSD C) marijuana D) heroin

Biology & Microbiology

Which of the following organelles contains microtubules? 

A. mitochondria B. cilia C. cell membrane D. ribosomes

Biology & Microbiology