Acline:

a. was used to describe human variation as early as the renaissance.
b. describes the pattern of occurrence of trisomy 18.
c. is variation that falls into discrete categories.
d. is continuous variation that follows a continuum.

(D) is continuous variation that follows a continuum.

Explanation:

A cline is a gradient of a phenotypic or genetic character within a single species which is continuous along the line of evolution

this headline suggests that midterm congressional   elections are at the corner and trump administration wants to activate his base by vowing to clamp down on immigrants and immigration as trump had said during his election campaign around two years ago. when a baby is born in usa, the baby becomes citizen of usa for 85 years and trump wants to end this rule of birthright citizenship to control illegal immigration and this what he said in an interview""we’re the only country in the world where a person comes in and has a baby, and the baby is essentially a citizen of the united states for 85 years, with all of those benefits,” "

where are the choices