Which level of organization includes all the organisms on earth and all the non living things that they interact with?

A)biome
B)biosphere
C)community
D)ecosystem

Harvey mixes two liquids. which observation of the new mixture most likely indicates a precipitate is forming?

V1t2 = v2t1 is an expression of who’s law

Consider hydrogen in an excited state n = 5n=5 that emits photons to reach the ground state. there are various possible transitions other than straight to the ground state that can occur; for example, it can drop to the n = 3n=3 state followed by the n = 3n=3 to the ground state transition. which of the possible transitions will result in the emission of a photon in the visible region?