Which of the following gases has no effect in the blood until hyperbaric conditions occur (as in SCUBA diving when one stays down too long at great depths), when a condition called ""rapture of the deep"" occurs, producing a narcotic-like effect, as this gas interacts with other blood chemicals?

a. Nitrogen
b. Oxygen
c. Carbon monoxide
d. Carbon dioxide
e. Helium

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

The wings of insects, birds, and bats evolved independently but carry out similar functions. this is an example of a. analogous structures. b. embryonic structures. c. vestigial structures. d. homologous structures.

Which zone within the open-ocean zone is home to the most organisms? deep zone surface zone intertidal zone transition zone