Question

24/25 biotic factors are... atmosphere living things/ organisms algae dead things

Explanation:

In biology (a subfield of Natural Science), biotic factors are defined as the living components of an ecosystem, which include all living things or organisms. The other options: "atmosphere" is an abiotic (non - living) factor related to the environment, "algae" is a type of biotic factor but is too specific to define biotic factors generally, and "dead things" are not considered biotic factors as biotic factors refer to living entities.

Answer:

B. living things/ organisms (assuming the options are labeled A: atmosphere, B: living things/ organisms, C: algae, D: dead things)