input: OPTIONS:
- fertilization
- spontaneous mutation
- mass extinction
- next generation Now, answer this question: Q: Natural selection can only take place if there is variation, or differences, among individuals in a population. importantly, these differences must have some genetic basis; otherwise, the selection will not lead to change in this? A:
A:
output: next generation

Q: What forms the small holes found in bread? A:

OPTIONS:
- yeast
- oxygen
- carbon monoxide gas
- carbon dioxide gas

Answer: carbon dioxide gas

Problem: OPTIONS:
- source mechanism
- elemental mechanism
- potassium mechanism
- reaction mechanism
Q: Q: What term is used to describe the sequence of elementary steps that together comprise an entire chemical reaction? A:
Answer: reaction mechanism

Problem:OPTIONS:
- metabolism impulses
- energy
- neurotransmitters
- nerve impulses

Q: Neurons are classified based on the direction in which they carry what? A:
****
A: nerve impulses

Q: What type of energy is useful to humans because it's ease of transport and conversion to other forms of energy? A:
OPTIONS:
- physical
- potential
- heat
- electrical
electrical

Q: The extent to which a substance may be dissolved in water or another solvent is known as what? A:
OPTIONS:
- humidity
- flexibility
- turbidity
- solubility

Answer:
solubility