A relationship in which one species benefits and the other is harmed is

A. mutualism.
B. cooperation.
C. commensalism.
D. parasitism.

Endeleev saw trends in the physical and chemical properties of elements when he organized them by

Pastoral farming is best described as a. a method of raising livestock and moving herds b. an african method of agriculture c. a method of cultivating crops on poor soils d. a common method of desert farming select the best answer from the choices provided a b c d

What does a numerical subscript following an element in a chemical formula mean?