How many years ago did scientist believe the earth was formed

Why do you sandy beaches form at many sea shores

Dominance the dominant allele doesn’t fully mask or hide the recessive. for example, a red carnation with a white carnation will produce a carnation. one gene one trait. well most of the time than one gene controls a trait. we are all different but genetically speaking we are % similar with regards to genetic makeup.

I’m doing some practice exam questions for biology, and i’m not sure how to do these 3 parts to the question.