Starting billions of years ago, algae lowered the

atmosphere.

levels in the

A. oxygen

B. ozone

C. carbon dioxide

D. methane

During the process of embryogenesis, formation of multiple cell types from stem cells occurs due to differentiation. metamorphosis. divergence. reorganization.

In the Gross Anatomy of Muscle Lab Manual, the triceps brachii is considered what in the action of the extension of an elbow?

Collect energy to produce their own food

Faults are fractures in Earth's crust where displacement has occurred. True False

Which theme of biology explains the modification of an organism's parts to adapt to its habitat? Interdependence in nature Relationship of structure to function Continuity and change

Scientists were able to determine the age of the earth from rock samples that were analyzed. What technique was used to do this

How does the human heart organization relate to cells? To organ systems?

Why could a diet low in carbohydrates be dangerous?

What is a pathogen free environment

which object would take the most force to hold up in the air? A. a bus B. a chair C. a balloon D. a nail