Measuring its costs and benefits in terms of energy spent and/or gained, competition among individuals:
A. is a lose-lose interaction.
B. results in gain for both individuals.
C. results in a gain for one individual and a
loss for the other.
D. results in a gain for one individual and
neither a gain nor a loss for the other.
E. none of these
A
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In order to prove that a bacterium is pathological according to Koch’s postulates, the ____
a. bacteria must be present in most cases of the disease b. bacteria must be isolated from the infected host and grown in mixed culture c. specific disease must be induced when a pure culture of the bacteria is introduced into a healthy host d. bacteria must be isolated from a transfer host e. bacterium must produce spores that can be transmitted from one individual to another
Refer to the accompanying figure. Which structure is the blastocoel?
a. 1
b. 2
c. 3
d. 4
e. 5
Glucose, C6H12O6, is best described as a(n)
a. element. b. isotope. c. compound. d. ion. e. atom.
Which of the following would tend to produce populations with little genetic diversity?
A. sexual reproduction between different subspecies B. increasing the size of the population C. encouraging the immigration of individuals into the population D. producing a population from two original parents