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.
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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.
Archaeal promoters are most similar to those of ________.
A. bacteria B. viruses C. eukaryotes D. both viruses and bacteria
What components do all cells possess?
What will be an ideal response?
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