Afferent nerve fibers carry signals from the somatic receptors to the posterior horn of the spinal cord or to the brainstem. So i beleive it is 4 but not too sure. Hope this helped a bit (:
Answer:
C
Explanation:
As air passes through our own body causing respiration
I would say the answer would be D.
Because: If a river is dammed then there is little to no flow going downstream. This will effect the life downstream and also change its conditions.
I Hope This Helped!
1. mitochondria
2. rough endoplasmic reticulum
3. plasma membrane
4. nucleus
