1. What stage of cell respiration is being shown here?
2. Which molecule has higher energy: ADP or
ATP?
3. What do cells use ATP for?
4. When four hydrogen atoms bind with oxygen
and four electrons, what molecule is created?
5. Count the number of hydrogen ions, oxygens,
and electrons on both sides of the equation
shown. Are they the same?

The circles, or orbits, for electrons are called energy levels. each level can hold only a certain number of electrons. add electrons to each level until you can't add any more. how many electrons can each level hold?

Darrel conducted an experiment with the following procedure: fill two cups with ice water. place an uninflated balloon snuggly onto your left index finger. blow a little air into an identical balloon, and place it onto your right index finger. place both fingers into the cups of ice water. darrel noticed that his right finger felt warmer in the ice water than did his left finger. which of the following does the experiment show? a. air is a good radiator of heat. b. air is a good insulator of heat. c. air is a good conductor of heat. d. air is a good convector of heat.

What was the land like over 500 million years ago? what was under the sea?