Troll Question:
What human species are we?

Question:
What makes up our nervous system?

Question:
What is electromagnetic spectrum?

Question:
Define endocrine system

Question:
What is homeostasis?

Question:
What are waves of energy?

Question:
What is radiation?

Question:
Old mobile phones used to communicate through?

Question:
How do we get electricity?

Question:
How many senses do we have?