I WILl GIVE BRAINLIEST A. Many dinosaurs were present in upper layers of rock strata, but not in lower layers.

B. In younger layers of rock, there would be few to no fossils of dinosaurs indicating many died out.

C. Fossils for dinosaurs in older layers were not present, but in younger layers, there were many.

D. In older layers of strata, the dinosaur fossils found were larger and less of them than in younger layers.

we solve the problem using the hardy-wineberg equation.

let us start with the homozygous recessive proportion of individuals with sickle cell anaemia,

we have the proportion as q² = 0.25.

∴ q = 0.5 (frequency of hbs in population)

further,

solving for the frequency of normal cell by using the fact that,

p + q = 1

∴ p = 1 - 0.5 = 1 - 0.5 = 0.5

now we can calculate 2pq in p² + 2pq + q², which is the frequency for heterozygous carriers of sickle cell anaemia,

∴ 2pq = 2 x 0.5 x 0.5 = 0.5

and the homozygous normal cell individuals proportion is given by the expression,

∴ p² = 0.5² = 0.25

hence, the carriers for sickle cell anaemia are in proportion, 0.5, or 50%.