Find a partner. Using the analogy, explain to your partner how life on Earth evolved over billions of years.

Find a partner. Using the analogy, explain to your partner what might happen if all the decomposers disappeared from Earth.

How does the analogy of a lock and key to an enzyme and its substrate help you to understand how enzymes function in the body?

Which era in the phanerozoic lasted the longest? How long did it last?

How would you buffer a solution that has a pH of 12?

Identify two solutions that have more H+ ions than OH- ions.

Identify two solutions that have more H+ ions than OH- ions.

Identify two solutions that have more OH- icons than H+ ions.

Describe an example of coevolution.

Look at the diagram you labeled punctuated equilibrium. How do you know that this diagram shows evolution occurring rapidly?

Look at the diagram you labeled gradualism. How do you know that this shows evolution occurring over a long period of time?

Galapagos tortoises are certainly not the only organisms that show variations. Describe variations you have observed among another group of organisms, like plants, butterflies, birds, or fish.

Which of Lamarck's ideas turned out to be true? Which turned out to be false?

Each of the following statements is false. Rewrite the statements to make them true: Oceans on early Earth were blue because they contained lots of dissolved iron.