A one-way relationship in which one species benefits at the expense of another is ____
a. commensalism
b. competitive exclusion
c. parasitism
d. obligate mutualism
e. a neutral relationship
ANSWER: c
You might also like to view...
Mutation differs from other sources of genetic variation because it
A) always harms the phenotype. B) is unpredictable. C) only affects some populations. D) introduces a change, rather than acting upon existing alleles.
Entry of mineral ions into the xylem is regulated by cells of the cortex.
Answer the following statement true (T) or false (F)
________ isolating mechanisms lead to reproductive isolation by preventing the formation of hybrid zygotes.
Fill in the blank(s) with the appropriate word(s).
Looking into your microscope, you spot an unusual cell. Instead of the typical rounded cell shape, the cell has a very narrow middle separating two bulging ends. It sort of looks like the number 8! You realize that this cell is
A) undergoing cytokinesis. B) in the S phase of interphase. C) in the G1 phase of interphase. D) about to undergo mitosis.