What limited protection do cells have against the damaging effects of uv radiation?

One of the largest seafood exporters to the united states is a. china b. brazil c. mexico d. saudi arabia

In a relatively small iguana population the allelic frequency is tracked for three generations. webbing is a recessive allele; no webbing is the dominant allele. during one very rainy spring and summer, a flood washes all the iguana without webbed feet out to sea. by the fall, and three generations later, you have the gene pool seen here.

Which experiment would most likely contain experimental bias ?