Lf cows produce more milk when fed wheat then the cows that were not fed wheat will produce less milk

Explain the source of radioactivity in uranium in earth’s crust by which it produces nuclear radiation

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.

Can someone give me the answers to this?