Nucleus would be your answer
The chemical composition of bone is made up of collagen and calcium, which makes bones stronger
Abiotic factors in common ecosystems:
1: Bats are interesting creatures, and use echolocation to make food
2: The cave walls help spread the voices of the bats
3: They have to use echolocation to breathe
Biotic factors:
1: Some good roles for bats are predators
2: They effect the system of computers when they bite computer chips
3: They complex human system life<span />
Answer:
a. Produces antibodies in response to antigen exposure in the brain tissue
b. Found in the ventricles of the heart brain
c. Produces by te choriod plexus
d. Blocks blood toxins from brain tissue
e. Prevents concussions.
Explanation:
plz bhai mera answer ko brainliest kar do please...
I think the answer is oxygen, but not 100% sure
