Practice Problem 1
Mark Yourself Question
- Grab a piece of paper and try this problem yourself.
- When you're done, check the "I have answered this question" box below.
- View the solution and report whether you got it right or wrong.
Consider the following:
a. Cat
b. Virus
c. Red blood cell
d. Tree
e. Protein
f. Bacterium
g. Chloroplast
Which are considered to be alive, and which are not? Why?