Explain how one receptor can induce different phenotypes in different cell types.

It is possible since a receptor can activate different signaling pathways in different cell types  

Explanation:

In a cell, a receptor bind to a specific ligand to activate a signaling pathway, while the same receptor may bind either with the same or another ligand in another cell type and thus activate another signaling pathway

the answer is a) cell division.

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c. establishing proper sleep hygiene