Which contribution did ptolemy make to our view of the solar system? a. he proposed the sun-centered model of the solar system. b. he showed that planets moved in elliptical orbits. c. he proposed that gravity kept the planets in their orbits. d. he proposed the earth-centered model of the solar system.

Which of the following is the source of energy for photosynthesis? a.) glucose b.) chlorophyll c.) carbon dioxide d.) sunlight

If a strand of dna has 35% thymine. what is the percentage of cytosine, adenine, guanine?

Research question: why are the carrots that grew on the left side of the garden larger than the carrots that grew on the right side of the garden? which hypothesis is based on this research question? a comparison of people with gardens to people without gardens will show who is likely to live longer. b. carrots are thought to be good for your eyesight and should be eaten regularly. c. carrots that are provided lots of sunlight grow to a larger size than carrots grown in the shade. d. eating fresh vegetables every day is a healthy thing to do.