Human Ear - How do ears help with balancing?
Human Eyes - Why do we have two eyes instead of one?
Osmosis - Why is grass killed if salt is sprinkled on it?
Photosynthesis - Why is the upper surface of a leaf more green and shiny than the lower surface?
Respiration - Why is it not good to sleep under a tree at night?
Turgor Pressure - Why does a Touch Me Not plant close?
Stomata - Why do water lilies have stomata on the upper side of their leaves?
Respiration in Plants - Why should we not overwater potted plants?
Transpiration - Why do cacti have spines?
Nervous System - Why don't we feel pain when we cut our hair?