Q: What do we call the worldwide radio-navigation system formed from a constellation of 24 satellites and their ground stations? Choices: - cellular network - radio waves - compass - gps A:
gps

Q: The hemolymph and body cells exchange chemicals within what body part? Choices: - the lungs - the heart - the gums - the sinuses A:
the sinuses

Q: Q: What is formed when atoms of different elements combine in a chemical reaction? Choices: - crystals - dust - toxins - compounds A:
A: compounds

Question: Q: What is the smallest main part of the brain? Choices: - the cortex - the claw - the cerebellum - the stem A:
Answer: the stem

*Question*
Q: In the humoral response, what protein substances help neutralize or eliminate toxins and pathogens in the blood and lymph? Choices: - platelets - membranes - parasites - antibodies A:
**Answer**
antibodies

*Question*
Q: Osteoclasts break down bone to maintain mineral what? Choices: - density - fluctuations - polarity - homeostatis A:
**Answer**
homeostatis