As long as you are referring to the green plants aka producers of the food chain/web.
An organ is made of tissues. A tissue is made from multiple cells that carry out the same function, For example : a cardiac muscle is made from many cells of the same type. An organ whereas is made from group of tissues which have similar structure and functions.
I hope this helps.
Answer:
Red blood cell has lot of haemoglobin to carry more oxygen
Answer:
The Sun is the middle and is a source of heat
C- immune and integumentary