1 (One question that scientists tried to answer for many years dealt with planetary motion. How did they go about trying to determine the orbits of the planets? What were some of the models that were developed? What were the contributions of the various scientists discussed in the unit to our understandings of this topic?)2.( Describe steps involved with scientific methods. What are the things that scientists do to try to answer questions? Thinking back to question 3, how were scientific methods used in the quest to explain planetary motion? ) (Describe the different spheres of earth. What is each one made up of? Which sphere is the largest and what are the layers of that one? How do these interact with one another (provide at least 2 specific examples)? How do humans interact or affect the different spheres (give at least 2 examples)?

Copernicus's model states that the sun is in the center, and that the planets move around it in a circle. Kepler's first law of planetary motion says that they move around the sun in an ellipse.At the age of 27, Kepler became the assistant of a wealthy astronomer, Tycho Brahe, who asked him to define the orbit of Mars. ... Using these observations, Kepler found that the orbits of the planets followed three laws.Johannes Kepler, (born December 27, 1571, Weil der Stadt, Württemberg [Germany]—died November 15, 1630, Regensburg), German astronomer who discovered three major laws of planetary motion, conventionally designated as follows: (1) the planets move in elliptical orbits with the Sun at one focus; (2) the time necessary to ...

Explanation:“If the Earth's orbit were a perfect circle, we would not have seasons.” This statement is clearly false. A perfectly circular orbit would mean that the earth is always the same distance from the sun. However, the primary cause of our seasons is the tilt of the earth's spin axis with respect to its orbital plane.

the answer is b

explanation:

they fuse to form they have half as many chromosomes as a somatic cell of the same individual. b