The problem of respiratory system
Answer:
No; the study is based on a volunteer sample, which may be very different from a randomly selected one.
Explanation
Her plan cannot be effective because she could base her own judgenent on samples that was randomly selected for consideration.
Answer:
d and a
Explanation:
the central nervous system is the central obviously and the peripheral nervous system takes the information the CNS wants to send and send thm to the correct organ.
