The air above Earth's surface is at different temperatures. What is responsible for this difference in tempeture?

Nucleic acid certain protein cell membranes certain carbohydrates

What is used to keep track of the gamates and possible offsprings combination

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.