Many introduced species have had deleterious
effects on communities and ecosystems
because
a. coevolved parasites and pathogens are
absent.
b. the introduced species are long-lived.
c. predators prefer the introduced species, and
the local prey therefore proliferate to
dangerously high levels.
d. the community from which they came lost
an important predator, competitor, or
parasite.
e. human beings do not know how to
appreciate them
A
You might also like to view...
The ratio of the vapor pressure of the air in equilibrium with a substance to the vapor pressure of pure water is known as
A) water activity. B) vapor activity. C) positive water balance. D) osmosis.
The process where organisms act to maintain a relatively stable internal environment is ________.
Fill in the blank(s) with the appropriate word(s).
DNA is composed of repeating units of sugars, phosphates, and nucleic acids. This is an example of a
A) polymer. B) monomer. C) salt. D) micelle. E) lipid.
Often point mutations can cause a protein to be made that differs in just one amino acid. Which of the following changes is most likely to cause the greatest change in protein function?
A) a mutation that replaces a valine with an isoleucine B) a mutation that replaces a proline with an aspartic acid C) a mutation that replaces a glutamic acid with an aspartic acid D) a mutation that replaces a serine with a cysteine E) a mutation that replaces an asparagine with a glutamine