If you know an index fossil existed between 20 and 15 million years ago, what can you assume about the age of the rock in which the index fossil is found?

for a different answer set the answer would be because the oxygen in the water had depleted (apex)

the hardy-weinberg equation is as follows:

where is homozygous dominant, 2pq is heterozygous, and is recessive.

we also know that:

so since we know that homozygous dominant is 0.53, we can solve for p:

so then we can solve for q:

so then we can solve for the heterozygous term:

so now we know that the percentage of the population that should be heterozygous is 39.6%.