Why is iodine able to diffuse across a membrane while starch was not

Freckles are a dominant trait in humans. both of the girls have the genotype ff for freckles. if either one marries a man with no freckles, what are the chances that their children will have freckles?

Achild is suffering from fever but the doctor cannot immediately pinpoint the alignment on the basis of this one symptom explain why also mention other two such general symptoms

How energy flows through each level in this energy pyramid. is all the matter and energy from one level transferred to the next level?