A behavior must affect an organisms fitness and have a genetic basis.
There are two types of aging, primary aging and secondary aging.
Anything that cannot be controlled is called primary aging, things that can be controlled such as physical factors, are called secondary aging.
Hope it helped,
BioTeacher101
Water makes up 90% of the body.
Photosynthesis deals with plants that are a living being receiving energy from sunlight which is not living.
