Should Ap exams remain in person or maintain virtual instruction

What are the main functions of the human skeleton? a exchange of gases b support and movement c sensing the environment d digestion and excretion

Doing a science fair project should i do cafeteria waste or solar power

What is the correct way to represent 5600 l using scientific notation? a)-5.6 x 1034 b)-5.6 x 10-3 l c)5.6 x 10-3l d)5.6 x 103 l