Humans have to eat food to get the nutrients that keep us alive, but plants use the sun to power photosynthesis

Funny! I am doing the same thing. Maybe we can help eachother

Humans have to grow, hunt, and gather food, but many living things aren't so constrained. Plants, algae and many species of bacteria can make their own sustenance through the process of photosynthesis. They harness sunlight to drive the chemical reactions in their bodies that produce sugars. Humans have complicated digestive system and are not designed to use photosynthesis to process their food.

I hope this helped.

i think it would be b. tissue because an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.