Raya is a gardening enthusiast who is looking to buy a new house. she wonders whether her house plants will grow well if she buys an apartment on a higher floor. she remembers that her friend jenn also has a small garden on her balcony, and her plants seem healthy. raya conducts an experiment to study the effect of altitude on the growth of plants. she gathers plant samples and places them on five different floors of a 20-story building. identify the basic components of raya’s experiment, including the confounding variable.

80 points pls brainliest 1. what does a red shift mean? blue shift? 2. describe the big bang theory. according to this theory, how old is the universe? 3. scientists believe the universe is expanding. what is the evidence that supports this? 4. describe a nebula. 5. describe the 3 types of galaxies. what is a barred spiral galaxy? 6. what is a light year? how far is alpha centauri from earth? 7. describe the universal law of gravitation. be sure to include gravitational force between two objects. 8. describe the planets’ orbits around the sun. 9. what is the asteroid belt? where is it located? 10. describe rotation and revolution of earth. what determines an earth day and year? 11. how do galaxies exist? 12. compare and contrast the inner and outer planets. 13. what causes the seasons?