During which geologic epoch do scientists infer that the earliest grasses first appeared on earth?

Which statement describes why the us forest service is important a-it protects ecosystems, supervises public access of lands, and manages wilderness areas. b-it supervises public access of lands, manages wilderness areas, and enforces federal wildlife laws. c- it manages wilderness areas, enforces federal wildlife laws, and foreign governments with international conservation efforts. d- it enforces federal wildlife laws, foreign governments with international conservation efforts, and protects ecosystems.

Plants can have a positive and negative effect on the rate of weathering

Which soil layers comprise the topsoil? o horizon a horizon b horizon c horizon