Two bases of DNA connects the double chain of DNA like a step on a ladder.

True/False

11. During what time frame was the fastest addition of a billion people to the human population?

When are to animals classified as belonging to the same species?

Plants use the energy from the sun to convert A) water into sugar. B) carbon dioxide into sugar. Eliminate C) carbon dioxide into water. D) oxygen into carbon dioxide.

The radiation weighting factor for x - rd is 10 true or false

What are proteins made of?

How does light intensity affect oxygen production?

Which organism would be classified as an echinoderm?

Hank has a very detailed model of the solar system where each planet is made out of granite rock. Since his little sister really liked the model, he spent two weeks in his dad's workshop building her a Styrofoam copy.

Match each theory with the correct description 1 big bang theory 2. inflation theory There was no initial explosion. The universe has always been and continues to be as it is now.

How are all living thing made of cells