hormone erythropoietin (EPO) is responsible for the production of red blood cells.
In a mixture, elements are not chemically reacted. The elements forming a mixture can be separated by physical methods. These methods include titration, boiling, filtration and so on.
On the other hand, compounds are formed by the chemical combination of two or more elements. This means that the elements forming the compound cannot be separated by physical means . A chemical reaction must be used to separate the elements forming a compound.
Big dogs and short dogs, short hair and long hair, pointy ears and droopy ears
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Answer: B) It is going through a physical change.
Explanation:
A physical change is defined as a change in which there is alteration in shape, size etc. No new substance gets formed in these reactions.
Example: Freezing of water
The solid water can be changed to liquid by heating or lowering the pressure.
The chemical make up of water remains same.
A chemical change is defined as a change in which a change in chemical composition takes place. A new substance is formed in these reactions.
Example: Corrosion of iron
It can not be reversed.