Question
Write down four symptoms of sick animals.
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| | X | Y |
| Protons | 8 | 8 |
| Neutrons | 8 | 9 |
| Electrons | 8 | 8 |
Describe with the help of a diagram, how compressions and rarefactions are produced in air near a source of sound.
What are common names? Write down their disadvantages.
What is differentiation?