Desmatosuchus was a crocodile relative that lived only during the Triassic Period. Horsetails are
plants that first appeared in the Triassic Period and still exist. Which of these organisms would be more
useful as an index fossil for the Triassic Period? Why?

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.

Ascientific idea becomes valid when it is what?

What is the process by which biological parents pass traits such as hair type or eye color to their children