The brain stem is central trunk of the brain, consisting of the medulla oblongata, pons, and midbrain, which continues down into the spinal cord.
Adrian’s adaptive immunity remembered the antigens from the virus and gave him lifelong immunity to it.
Answer:
The excretory system is a passive biological system that removes excess, unnecessary materials from the body fluids of an organism, so as to help maintain internal chemical homeostasis and prevent damage to the body.
Explanation:
Yes, Organisms compete for the resources they need to survive like food, air, water, space. In areas where these are sufficient, organisms live in comfortable co-existence, and in areas where resources are abundant, the ecosystem boasts high species richness (diversity).
