Almost all terrestrial species spend their entire lives within a narrow zone that extends from a few tens of meters above the tops of the trees to a few meters below earth's surface. therefore, terrestrial organisms are relatively easy to study, as they are readily accessible and visible to the scientist. in contrast, ocean life is present throughout the depth of the ocean waters, and for several meters, or more, into the sediment.(douglas a segar, introduction to ocean sciences)
a. argument; conclusion: they are readily accessible scientist.
b. argument; conclusion: almost all terrestrial species surface.
c. argument; conclusion: in contrast, ocean life the sediment.
d. argument; conclusion: terrestrial organisms are relatively easy to study.
e. nonargument.