Fact 1: Behaviors that improve fitness increase through natural selection. Fact 2: Natural selection is the mechanism of evolution. Given the two facts above, answer the question "Behaviors that improve fitness improve through what" with the following options: - Riding a bike - environment - reduced heat - sleep - competition - evolution - Summer - Energy
evolution

Fact 1: Ethanol is produced by alcoholic fermentation of the glucose in corn or other plants. Fact 2: Methanol and Ethanol are two types of alcohol fuels used in cars. Given the two facts above, answer the question "Which product is widely used today to make fuel for cars?" with the following options: - swamp gas - corn - comets - meteorites - fat - energy - oil - Carbon
corn

Q: Fact 1: If gas is heated then that gas will expand. Fact 2: Chlorine is a type of Green Cross gas. Given the two facts above, answer the question "what will expand when heated?" with the following options: - arteries - water vapor - breathing - viewing - condensation - a prism - glass - chlorine
A: chlorine

Question: Fact 1: Thick fur can be used for keeping warm. Fact 2: Carpet beetle larvae feed on the keratin and chitin commonly found in wool, fur, or feathers. Given the two facts above, answer the question "What can be used for keeping warm?" with the following options: - keratin - vacuum - four limbs - energy - cold - engines - magic - heat
Answer: keratin

*Question*
Fact 1: Cells cannot survive without oxygen. Fact 2: Plants breathe oxygen into the atmosphere. Given the two facts above, answer the question "Cells cannot survive without plants breathing into what?" with the following options: - carbon dioxide - seas - Sulfur dioxide - lungs - water vapor - atmosphere - water - water tanks
**Answer**
atmosphere

Fact 1: Ejaculation occurs when muscle contractions propel sperm from the epididymes. Fact 2: Sperm motility is the ability of the sperm to move. Given the two facts above, answer the question "What do muscle contractions give the ability to happen?" with the following options: - heat energy - movement - metriculation - Energy - fallopian tubes - ejaculation - kinetic energy - sperm
ejaculation