What are two differences between phototropism and gravitropism in plants?

When should a bar graph be used? a. when there is no independent variable. b. when the independent variable is continuous and does not show a relationship to the dependent variable. c. when the independent variable is continuous and shows a causal link to the dependent variable. d. when the independent variable is composed of categories and does not show a relationship.

Cell specialization occurs by the process ofa. reproductionb. differentiationc. maturationd. growth

What is the difference between an igneous, sedimentary and metamorphic rock