The smooth muscle that alters the diameter of the pupil is the

Circular and Radial muscles.

Explanation:

The pupilarry response is the variation of pupil's size due to a variety of causes (exposure to light, sexual stimulation, drugs) and it consists of two movements, constriction and dilation.

The constrict response occurs thanks to the circular muscle and the dilations is triggered by the radial muscle, both of them are smooth muscle.

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im not intirely sure but i think the anwser is d relative humidity

on island x the species needed to adapt because they were being subject to predators which didn't inhabit island y.