B.
Groups of similar cells that do a particular job.
Do u mean- on brainly?
I'm pretty sure there are about 13million who actually use brainly so
if that's the right answer u were looking for then there u go lol
I think the answer should be B as well hope it helps
Symbiotic Relationship.
Hope this helps.
Answer:
C
Explanation:
For productivity to increase, it require an increase in the input which has to be directly proportional to an increase in the output
