What is any factor of an experiment that is not changed called

How do tides affect the organisms living in intertidal zones? a. no organisms live in intertidal zones due to the tumultuous environment. b. the mechanical forces of the waves keeps the organisms clean. c. only plants live in intertidal zones because the animals float away with the waves and never return. d. the mechanical forces of the waves can dislodge the organisms from their habitat.

Works together in the synthesis, modification, packaging, and transport of lipids and proteins

Acommon kind of mechanical weathering is called