I think this is what you're asking.
Examples of Inherited Traits:
Attached or Free Earlobe. If you look closely at your earlobe, it might be a smooth line, or slightly dangly (free).
Allergies. The most common one I think is gluten.
Very simply, I think that they may block the sun's rays from reaching the Earth, cooling down the planet, or they may eventually end up being turned into acid rain and rain back down to the Earth.
Answer: The sensual aspect of intercourse became more important.
Explanation:
There are different development stages in humans; from infant to adolescent to adulthood. The word "When humans begins to walk upright' shows the development stage of maturity. This usually takes place in adolescents. The sensual aspect of intercourse became more important. Sex is one of the drives that is behind every thought, feeling, and behavior.
All the organisms that eat the middle organisms will die and the organisms that get eaten by the middle organisms will flourish.