Populations are best defined as

A. all members of a species.
B. all organisms found in an environment.
C. metacommunities.
D. families.
E. groups of interbreeding populations.


E. groups of interbreeding populations.

Biology & Microbiology

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Earthworms move by using

a. a hydroskeleton and synergistic muscle pairs. b. an internal bony skeleton and skeletal muscles. c. an exoskeleton and skeletal muscles. d. a hydroskeleton and antagonistic muscle pairs. e. an exoskeleton and synergistic muscle pairs.

Biology & Microbiology

Archaeal promoters are most similar to those of ________.

A. bacteria B. viruses C. eukaryotes D. both viruses and bacteria

Biology & Microbiology

What components do all cells possess?

What will be an ideal response?

Biology & Microbiology

Adult giraffes can be up to 20 ft. tall, and thus require special adaptations to maintain appropriate blood pressure. One adaptation is the rete mirabile, a group of blood vessels that form a web or net-like structure to slow blood flow.Although especially useful to the giraffe, the rete mirabile is similar to a countercurrent heat exchange system in other related, less evolved, mammals. Thus a mechanism for ________ homeostasis is likely to have evolved from a mechanism previously used for ________ homeostasis.

A. blood pressure; temperature B. blood pressure; pH C. temperature; blood pressure D. pH; blood pressure

Biology & Microbiology