Valerie designed and conducted an experiment on pothos plants, which are common houseplants. her hypothesis is that the direction of light will affect the growth pattern of a pothos plant. to test the hypothesis, she sets up two test groups of pothos plants and observes them three weeks later. the table summarizes the test groups and observations. test group growth conditions observations 1 light source is only on the side of the plant stems and leaves are bent toward the light 2 light source comes from all directions stems and leaves are not bent what are the roles of the two test groups in this investigation?

Me 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?