When using science to investigate physical phenomena, which characteristic of the event must exist? a. predictable b. repeatable c. provable d. readable

What is the answer for the complicated molecules that make up living things usually contain carbon. why is carbon so important in these molecules?

In the diagram below, the northern hemisphere would be in what season at position a a.fall b. winter c.summer d.spring

Which of the following is the best definition for the process of photosynthesis? a.) plants digest sugars to make energy. b.) plants use oxygen and glucose to make carbon dioxide. c.) plants use sunlight and carbon dioxide to make sugars. d.) plants use sunlight to make chlorophyll and chloroplasts.