A virus is not a bacteria, but it is caused by a bacteria. A virus causes the immune system to weaken.
Covalent bond because a covalent bond is when it only shares electrons and it doesn't give or lose.
Answer:
cell
Explanation:
It is the smallest unit of life that can replicate independently. It's the basic structural, functional, and biological unit of all known living organisms. The study of this is called cell biology.
C. photosynthesis happens in the cell
