How much time does it take to develop a new species?

How can you keep track of variables in a science experiment?

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.

In this experiment, the was intentionally manipulated. it is the independent variable. the dependent variables that were measured were the