What would the independent variable be in an experiment testing which types of paper airpane goes furthest

How do diseases caused by bacteria and diseases caused by viruses react to antibiotics?

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.

What is responsible for the uneven heating between the poles and the equator on any given day