Parasitism is the symbiotic relationship where one organism is harmed while the other benefits
The answer is (B) Brain. This is because the brain is a part of what is known as the nervous system just as the lungs are part of what is known as the respiratory system.
An ecological niche is an organism's specific habitat in an ecosystem.
It is where it lives and feeds, etc.
They both have a plasma membrane and protoplasm.
They both contain DNA.
