Which of the following practices involve the planting of crops on terraces or steps built on the slope of a mountainside? a. contour plowing
b. crop rotation
c. rip rapping
d. terracing​

What would happen to the nutrients in an ecosystem if decomposers, such as bacteria, didn’t exist there?

How do chloroplasts set plants apart from other living things

Examine the two squirrel populations in the accompanying figure. the populations are separated by a geographic barrier. if after a long period of time the two species are no longer separated, what evidence is needed to determine if speciation has occurred? the figure shows two populations of squirrels separated by a geographic barrier. examine the two squirrel populations in the accompanying figure. the populations are separated by a geographic barrier. if after a long period of time the two species are no longer separated, what evidence is needed to determine if speciation has occurred? the figure shows two populations of squirrels separated by a geographic barrier. polyploidy is creating new species. the two populations are not interbreeding freely. hybrid offspring of the two populations begin to appear. one species will increase into a population size twice as large as the other species.