Two specimens, a and b, were inoculated into urea broth. what can you conclude from your observations?

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.

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Which experiment would most likely contain experimental bias ?