scientists believe that the early universe started with only two elements, hydrogen and helium
true
or
false

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.

How are gene and protein sequences used to classify organisms?

For this question look at the hydropic diagram water that is heated by the sun evaporates. select the number that represents it.