What is the main source of energy for living organisms?

Which of the following is part of the circulatory system?

Which organ in the human body produces insulin?

Which organ in the human body is responsible for filtering waste from the blood?

Which of the following are eukaryotic organisms?

Which of the following are part of the central nervous system (CNS)?

Which of the following are sexually transmitted diseases (STDs)?

What is the organ responsible for pumping blood in humans?

 I am the molecule that carries genetic instructions in living organisms. What am I?

I am the sugar produced during photosynthesis. What am I?