In dry shrublands
a. plants are adapted to episodes of fire.
b. primary production is abundant throughout
the year.
c. there are constant cool temperatures
throughout the year.
d. winters are mild and summers are wet.
e. precipitation occurs evenly year round.
A
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A squirrel living in a park bisected by a busy street passes on a mutation to its offspring that allows them to judge the speed and distance of passing cars more accurately based on the vibration they cause in the ground. Over several generations, the percentage of squirrels expressing this mutation increases equally on both sides of the street. What principle does this demonstrate?
a. founder effect b. genetic drift c. microevolution d. equilibrium
Which of the following are NOT eukaryotes?
a. fungi b. bacteria c. plants d. animals e. protistans
The first and second lines of defense against microbial invasion are part of
A. innate immunity. B. adaptive immunity. C. species resistance. D. microbial antagonism. E. species immunity.
Organisms that grow best at pH levels above 10 are called ________ ________.
Fill in the blank(s) with the appropriate word(s).