Answer:
Tissues
Explanation:
Tissues are organized group of cells carrying out specific coordinated functions. They are organizational structures that lies between cells and organs. A group of cells binds together using specialized proteins forming a tissue, furthermore, a group of different tissues are the building blocks for organs and plant structures creating a complete system.
<span>Protocooperation is where two species interact with each other beneficially; they have no need to interact with each other.</span>
It is B and C. Have a nice day
