Individuals cannot evolve, but they may have that they can pass down to offspring as a favored trait for survival

People cannot evolve by themselves, but they have genes that they can pass down to offspring as a favored trait for survival. A gene is the basic functional unit of heredity. They are made up of DNA that act as instructions to make molecules and copy genetic traits. These genetic traits are instantly visible, such as eyes or color but others are not, such as blood type or risk for specific disease.

not too sure but maybe in the hot springs.

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.