They changed over time by finding the right ingredients such as iron, metal, or steel to forge different creations. They took so slowly because no one was discovered the things to make stone tools.
If you mean which species, it would be the Homo sapiens.
Yerkes-Dodson law says that moderated arousal levels can improve
performance up to a certain point. For example if you are a bit anxious for a test, that may actually make you perform better. If the arousal becomes to excessive, the performance reduces.
answer: <span>b. best; moderate</span>
The answer is B) states that we are born a blank slate.
At birth the (human)mind is a "blank slate" without rules for processing data, and that data is added and rules for processing are formed solely by one's sensory experiences.