Which of the following has no blood but respires?
1). Earthworm
2). Hydra
3). Cockroach
4). Fish
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2. Curd is sour due to presence of
3. Muscle fatigue is caused by the accumulation of:
4. The National Chemical Laboratoly (India) is located in
5. An ice block with a piece of lead embedded in it floats in water. If ice melts the water level
7. The natural resource known as black gold is
8. Heat transfer horizontally within the atmosphere Is called