Why are fossils from the cenozoic era, which began 65 million years ago, the easiest to find?
a. the number of species greatly increased during this era.
b. life on earth, in the form of cyanobacteria, began during this era.
c. fossils of the largest creatures are from this era.
d. fossils from this era are found in layers closest to earth’s surface.

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.

What is the best-known carbohydrate?

What kind of crystalline solid is graphite? o a. molecular solid b. metallic solid o c. network solid d. ionic solid