Which of the following statements describes a proton of an atom? a has a negative charge and is located in the nucleus. b has no charge and is located in the nucleus c has a positive charge and is located in outer energy levels. d has a positive charge and is located in the nucleus

Alaska and northern canada have a diet rich in vitamin d and their skin color is darker than predicted on the basis of iv intensity at their latitude. explain the observation:

Last week i was assigned a thematic. we have groups of three but the people i was assigned with haven't been in school for days. i would appreciate if anyone can me with my thematic . i highlighted most of the important steps and i circled my thematic topic. in desperate need : ( its due on february 19

Describe two recent or ongoing space missions.