A. It is an excellent solvent B. Biological reactions take place in water C. Life forms are usually made primarily of water. D. All of the above
2. Which is the best meaning of abiogenesis?
A. It describes the emergence of life forms from nonliving chemical systems. B. It is another name for natural selection C. It means the same thing as spontaneous generation. D. It describes the emergence of small organisms from mud.
3. What reason energy is required for life?
A. To put together chemicals that form an individual B. It is needed for growth, reproduction and response to stimuli C. Energy sources may include other organisms, light, or organic compounds D. All of the above
4. Why did it take millions of years for life to appear on Earth after the planet had formed?
A. The planet had cooled down enough to sustain life. B. The planet had warmed up enough to sustain life. C. Life on Earth could begin only when seedlings arrived on our planet from other worlds. D. It took millions of years for RNA to replace DNA.
