() which best describes how johannes kepler developed his laws of planetary motion?
a.) he calculated the gravitational force on orbiting bodies.
b.) he debated with copernicus who proposed the heliocentric model.
c.) he examined the motions of planets through a telescope.
d.) he analyzed data collected by tycho brahe.

What would be an example of hypothesis for goldfish respiration lab

What is the most appropriate method of gaining weight (muscle mass)

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.