A primary source is a source that was created by a person who was there to witness it. So, the answer would be A, a document made by someone who actually saw an event. In other words, the document was written by someone who was there to witness the event.
The importance of cephalization is the development of a control center or brain. The brain is a concentration of nervous tissue that coordinates and controls sensory information and nervous activity. A larger brain allows for smarter and more complex animals.
A. parenting styles because I feel that parents have the most environmental influence. Sorry if I’m wrong!
The answer is D,
digesting food is chemical to chemical
photosynthesis is light to chemical
and clearly respiration isn't the choice as well