Farmers in the Midwestern United States routinely rotate between soybean and corn crops. Sometimes it is said that they do this because the soybeans introduce nitrogen into the soil
Although this is true, farmers also rotate their corn and soybean crops as a form of A) cultural control.
B) natural enemies.
C) genetic control.
D) natural chemical control.
A
You might also like to view...
What order has the most living bony fish species?
a. Chondrichthyes b. Osteichthyes c. Teleostei d. Coelacanths
Why does oil seep to the surface from its source rock?
A) Capillary actions B) Convection C) Oil is less dense than surrounding sediments D) None of these choices
Rocks that contain crystals that are roughly equal in size and can be identified with the unaided eye are said to exhibit a ________ texture
A) fine-grained B) coarse-grained C) glassy D) porphyritic
A stable, self-sustaining assemblage of species that would exist until the next major disturbance is known as a
A) sere. B) pioneer community. C) life zone. D) symbiont. E) climax community.