Why don't humans need to carry out photosynthesis

Just reword this in your own way: In a Nutshell : We can't photosynthesize because we don't have chloroplasts, and we wouldn't get enough food out of it to make it worthwhile anyway.

Because we already know everything but our brain needed to see it to remember  it but we think we just found out about when we already knew it but we need to see it

Explanation:

protein makes up the building blocks of organs, muscles, skin, hormones and pretty much everything that matters in your body.

some choices are:

peanut butter

seeds

eggs

yogurt

meats

fish

so pretty much meat, dairy, nuts, and grains.

other information encoded in your genes might distinguish you from the others in the group