The following table describes four different systems.

system description
food web both matter and energy are exchanged with other systems.
carbon cycle energy is exchanged with other systems, but the amount of carbon remains constant.
water cycle the amount of water remains constant, but energy is exchanges with other systems.
universe the amount of matter and energy remain constant.

which is an example of an open system?

Explanation:

This is referring to a open system, because it is defined as a system that as external interactions that can be exist trough matter or energy exchange. This kind of systems have an input and an output, having their internal processes to increase or decrease the energy.

increase soil erosion                                             reduce soil erosion

cattle grazing                                                         hydroseeding

deforestation                                                         contour plowing

                                                                                planting vegetation

plant roots basically hold the top soil

together and stop soil erosion because

in such situation top soil is not removed

during flood but cattle grazing causes

soil erosion because cattle consume the

grasses and herbs and top soil is exposed.

same situation occurs because of

deforestation, the trees and plants are cut

down to expose top soil which causes soil

erosion

you know they are heterozygous for a trait because they have it as jj or jj.