Q: Bone marrow, the thymus gland, the spleen, and the tonsils are organs in what body system? Choices: - skeletal system - nervous system - reproductive system - immune system A:
immune system

Q: The energy for an ecosystem can come from sunlight or _________? Choices: - radiation compounds - fossil fuels - rain - chemical compounds A:
chemical compounds

Q: Q: What is the name of the muscular tube that carries urine out of the body? Choices: - rectum - uterus - bladder - urethra A:
A: urethra

Question: Q: What is another name for a broad explanation that is supported by a great deal of evidence? Choices: - hypothesis - concept - conjecture - theory A:
Answer: theory

*Question*
Q: Solar cells turn sunlight directly into what? Choices: - gas - water - cold - electricity A:
**Answer**
electricity

(Q).
Q: Common wisdom has it that the temporal bone (temporal = "time") is so named because this area of the head (the temple) is where hair typically first turns gray, indicating the passage of what? Choices: - birth - ships - wealth - time A:
(A).
time