Whats my favorite subject, my name

Coquina, a type of limestone, forms from shell fragments that settle on the ocean floor. what type of rock is coquina?

How does the study of genetic disorders such as pku biologists understand normal alleles?

Which of the following statements is most likely correct about a rock belonging to the jurassic age and a rock belonging to the cambrian age? options: 1) they have identical fossils of organisms that have evolved over time. 2) both have animal fossils preserved in them due to weathering and erosion. 3) they contain different fossils because life on earth has changed through time. 4) the fossils in them were formed on the surface of earth due to exposure to sunlight.