What is the basis of an organic molecule?
a. the basic structure is the potassium atom
b. the basic structure is a carbon monoxide molecule
c. the basic structure is the iron atom
d. the basic structure is the carbon atom

Living cells cannot use heat to provide the activation energy for biochemical reactions because which choice(s) complete the sentence correctly? a) answer choice ii. eliminate b) answer choices ii and iv. c) answer choice iii and iv. d) all answers can complete the sentence.

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?

What is the difference between a scientific hypotheses and a scientific theory?