The esophagus and trachea both connect to what?

A) the pharynx
B) the nasal cavity
C) the epiglottis
D) the stomach


A) the pharynx

Biology & Microbiology

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The ticks of a genetic clock are measured by the

A. number of random mutations. B. number of dead cells. C. amount of RNA. D. amount of DNA.

Biology & Microbiology

Fishing by humans has severely affected populations of many different marine species, including whales. Examine the figure above, making sure to note what each axis represents. What can best explain the pattern for minke whales?



A. Minke whale populations were overfished in the early 1900s, then recovered in the 1970s as their competitors were killed off.
B. Minke whales are a new species that evolved during the 1960s as an ecological niche opened up.
C. Commercial whalers did not pursue minke whales until the more valuable whale species had declined.
D. Minke whales were too fast to catch until they become malnourished due to exploitation competition by other whales.

Biology & Microbiology

Some animal populations are kept in check by 

A. hosts. B. decomposers. C. amensalism. D. predators.

Biology & Microbiology

What can best be defined as a contest between two species for limited resources?

a) competition b) transition c) predation d) parasitism

Biology & Microbiology