A clinal distribution is one in which:. a. a biological trait or allele frequencies show a gradation over geographic space
b. a biological trait or allele frequencies show no gradation between populations
c. there is little variation in a biological trait or allele from north to south
d. the same frequency in a biological trait or allele is found everywhere

How do tides affect the organisms living in intertidal zones? a. no organisms live in intertidal zones due to the tumultuous environment. b. the mechanical forces of the waves keeps the organisms clean. c. only plants live in intertidal zones because the animals float away with the waves and never return. d. the mechanical forces of the waves can dislodge the organisms from their habitat.

The ancestors of plants that lived in water had plenty of water for the young. angiosperms are a group of land plants that evolved a reproductive trait for living on land. this trait protect young plants by allowing them to grow only when water is present and the conditions for healthy development are right. what trait most likely young angiosperms in this way?

Which component in a graph indicates an independent factor? a. y-axis b. x-axis c. scale