Which option is an example or a physical property?

toxicity.
rusting ability.
flammability.
melting point.

To sciences do not agree on which type of grocery bag is better for the environment what is most likely to come out come out of the disagreement

Which of the following best describes the expensive tissue hypothesis? brains require more energy, so the gut had to be reduced, and larger brains and tool use led to higher quality diets. increasing body size means that homo neanderthalensis had to include more fat in its diet. brains require more energy, so the gut had to be reduced as brains got bigger. brains require more fat, so the gastrointestinal viscera (gut) had to expand, and hands were needed to acquire more food.

In general, characteristics that an organism survive and reproduce become more common in a population over time. what mechanism of evolution cause this change?