If behaviors that improve fitness increase through evolution, then behaviors that improve fitness improve through what? Answer choices: - Riding a bike - environment - reduced heat - sleep - competition - evolution - Summer - Energy
evolution

If fuel made from corn is being used today in cars, then which product is widely used today to make fuel for cars? Answer choices: - swamp gas - corn - comets - meteorites - fat - energy - oil - Carbon
corn

Q: If if chlorine is heated then it will expand, then what will expand when heated? Answer choices: - arteries - water vapor - breathing - viewing - condensation - a prism - glass - chlorine
A: chlorine

Question: If keratin can be used for keeping warm, then what can be used for keeping warm? Answer choices: - keratin - vacuum - four limbs - energy - cold - engines - magic - heat
Answer: keratin

*Question*
If cells cannot survive without plants breathing into the atmosphere, then cells cannot survive without plants breathing into what? Answer choices: - carbon dioxide - seas - Sulfur dioxide - lungs - water vapor - atmosphere - water - water tanks
**Answer**
atmosphere

If muscle contractions cause the ability of ejaculation, then what do muscle contractions give the ability to happen? Answer choices: - heat energy - movement - metriculation - Energy - fallopian tubes - ejaculation - kinetic energy - sperm
ejaculation