In land mammals, the pelvic girdle is the point where the leg bones attach to the rest of the skeleton. Whales also have a small pelvic girdle. What type of evidence for common descent would include the whale's pelvic girdle?
A) a homologous gene
B) a homologous structure
C) fossil evidence
D) a vestigial structure
D
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The secondary immune response is ____ than the primary immune response because the secondary immune response
____.
a. more rapid; does not require B or T cells b. more rapid; involves memory B and T cells that have been stored c. slower; requires initiation of clonal selection of new B and T cells d. slower; requires more antigen than the primary immune response e. more rapid; is less specific than the primary immune response
Which of the following statements about the intermediate disturbance hypothesis are true? Check all that apply.
_____ The intermediate disturbance hypothesis predicts that most communities eventually reach an end-state or climax community. _____ Intermediate disturbance should lead to increases in species richness. _____ Disturbances tend to lead to the dominance of K-selected species. _____ An example of intermediate disturbance would be a tree fall in a mature rain forest. _____ Intermediate disturbance should lead to all successional stages being present in the community at the same time.
The burning of fossil fuels by cars and factories has most affected the ______________ cycle.
Fill in the blank(s) with the appropriate word(s).
________ is a steroid
A) Butter B) Sucrose C) Amino acid D) Estrogen