Question Detail
Question
Which of the following is a key observation that must be explained in a unifying theory about life? a. Organisms are rarely well-suited to their environments b. Evolution is based on descent with modification c. Many basic characteristics are shared by all living things d. All living things require oxygen to survive
Correct Answer
Option C is the correct answer.
Detailed Explanation
A unifying theory must explain the observed patterns in nature. One key pattern is the unity of life – the fact that many fundamental characteristics (like DNA, cell structure) are shared across incredibly diverse organisms. Option D is false (many organisms are anaerobic).
Hint
What is a fact about life that needs explaining? That so many different forms are so similar at the basic level.