To maintain homeostasis, the respiratory system depends on the nervous system for signals to
a. exchange gases with the circulatory system.
b. enhance the amount of available oxygen in the lungs.
c. release enzymes to increase the exchange of gases.
d. coordinate the muscles that control breathing.

What advantages does a pedigree have over a written passage?

Which of the following matches the organisms described with the correct domain? a. archaea--multicellular, eukaryotic organisms that do not have cell walls b. eukarya--single-celled and multicellular organisms, with a defined nucleus and a variety of nutritional sources c. bacteria--unicellular, eukaryotic organisms with cell walls that do not contain peptidoglycan d. bacteria--unicellular, eukaryotic organisms that always lack cell walls

This is collection of data made by comparing objects in standard units. in science, the units are metric.