The thickness of their peptidoglycan layers.
Explanation:
A chromosome is a strand of DNA that is encoded with genes. In most cells, humans have 22 pairs of these chromosomes plus the two sex chromosomes (XX in females and XY in males) for a total of 46.
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The effectors in somatic reflexes are striated muscles(skeletal muscle)
The effectors in autonomic reflexes are smooth muscles or glands