The center of the dna molecule, the rungs of the ladder, are composed of a. phosphates only. b. nitrogenous bases only. c. phosphates and sugars. d. nitrogenous bases and sugars.

How did the research presented in the article affect scientists' understanding of the evolution of eukaryotes

Which of the following are the ingredients that go into the plant and are needed for photosynthesis? select all that apply. 1.) soil 2.) seeds 3.) carbon dioxide 4.) minerals 5.) glucose (sugar) 6.) water 7.) light energy (sunlight) 8.) oxygen 9.) air

Penelope studies how the structure and function of the nervous system is related to behavior. she is a psychologist