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The pure water is also know as ....
distilled water
How does oxygen enter the water?
by photosynthesis or diffusion from the air
metallic compound that is supports the heath of teeth and bones is
calcium
metallic compound that can damage the nervous system is
mercury
What happen when the nitrates and phosphate enter the lake?
they case rapid grow of algae
plastic that can be broken down, or decomposed, by microorganisms is called
biodegradable plastic
What is the first step in purification of water to become domestic water?
remove large insoluble object such as rocks, plastic bag and branches
metallic compound that is needed in the production of hemoglobin is
iron
Leaks of sewage into drinking water will cause the disease for human such as ..
cholera, diarrhea, dysentery, typhoid and polio
Oxygen is removed from water by
respiration in plants and animals
