Across
- 2. Meteors that enter earth’s atmosphere from outer space get burnt in this layer.
- 3. nerves that help the brain to control our muscles.
- 6. Infectious disease transmitted by direct contact
Down
- 1. layer where artificial satellites orbit the earth.
- 4. method Of acquiring immunity against diseases through oral drops or by injections.
- 5. deficiency caused due to Vitamin C.