Which statement best explains the relationship between HbS allele frequency and malaria endemicity in Africa?

The table shows dates and appearance of index fossils. which rock layers can be dated most precisely? a) a layer containing both a fossil 4 and a fossil 3 b) a layer containing both a fossil 2 and a fossil 3 c) a layer containing both a fossil 1 and a fossil 4 d) a layer containing both a fossil 1 and a fossil 2

With the word calcite wich completes the analogy mineral, erosion, marble, or aragonite

The relationship between intron and exon