A group of organisms that can mate with each other and produce offspring that are able to reproduce.

Would you rather have telekinesis (the ability to move things with your mind) or telepathy (the ability to read minds)?

Would you rather spend a week in the forest or a night in a real haunted house?

Any behavior, structure, or internal process that allows an organism to make changes in response to environmental factors and live long enough to reproduce.

What is structure?

Anything that causes an organism to react.

Would you rather labor under a hot sun or extreme cold?

Would you rather have a personal maid or a personal chef?

The ability to cause change.

Would you rather have to eat a bowl full of worms or a live frog?

Would you rather have everyone you know be able to read your thoughts or for everyone you know to have access to your Internet history?

The gradual change in a species over time due to adaptations.

The ability to make constant adjustments to maintain the right amount of water and minerals in its cells.