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

Biology & Microbiology

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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

Biology & Microbiology

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.

Biology & Microbiology

The burning of fossil fuels by cars and factories has most affected the ______________ cycle.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

________ is a steroid

A) Butter B) Sucrose C) Amino acid D) Estrogen

Biology & Microbiology