1. the theory that chance is involved in evolution and that variation within a species is accidental. 2. the belief that chance rather than mere determinism operates in the cosmos. Cf. uniformitarianism. 1. Philosophy. a doctrine that the universe is governed only by rigid, unexceptionable law.
Share this set. an organism that produces its own nutrients from inorganic substances or from the environment instead of consuming other organisms. Autotroph. an organism that produces its own nutrients from inorganic substances or from the environment instead of consuming other organisms.
Cells are also defined according the need for energy. Autotrophs are self feeders that use light or chemical energy to make food. Plants are an example of autotrophs. In contrast, heterotrophs (other feeders) obtain energy from other autotrophs or heterotrophs.