Answer:
A.the flow of energy between organisms in an ecosystem
Answer:
Isotonic
Explanation:
A solution is isotonic to a cell if it has the same Concentration of dissolved particles as the cell. Water molecules move in and out of the cell at equal rate, so the cell size remains the same.
Answer:
Inside the air sacs, oxygen moves across paper-thin walls to tiny blood vessels called capillaries and into your blood. A protein called haemoglobin in the red blood cells then carries the oxygen around your body.
Explanation:
Hope this helps
There are two hydrogen atoms in a molecule of water.
Throwing waste in to water, or spilling anything in the water that's not supposed to be in the water
