What is a substance that contains only a single type of atom

Why is permeable soil best for plants that need a lot of drainage?

An observation that requires measurement is called quantitative observable or qualitative

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