Which variable is measured in an experiment

cell regulation is conducted by special proteins.

kelp are large brown algae that live in cool, relatively shallow waters close to the shore. they grow in dense groupings much like a forest on land. these underwater towers of kelp provide food and shelter for thousands of fish, invertebrates, and marine mammal species.

e) all of the above

i got you i did it ya know what it is just needing to fill this in for a quick task!