What serves as a standard of comparison to evaluate the effect of the independent variable on the dependent variable

Give three examples of plant activities that are affected by circadian rhythms and natural fluctuations in the length of daylight?

Which statement describes compounds a. compounds are made of one type of atom. b. compounds cannot be represented by models. c. compounds are represented by chemical formulas. d. compounds cannot be broken down into simpler forms.

Will camels hump ahrinks.give reason