Question

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Answer 1

1. Calculate the calorific value of the fuel. Answer: Total mass of fuel = 4.5 kg Total heat produced = 180,000 kJ Heat produced by burning 1 kg of fuel = 180,000 kJ/4.5 kg = 40,000 kJ/kg. So, calorific value of fuel = 40,000 kJ/kg.
2. The species which are at the verge of extinction and which are required to be protected and conserved are known as endangered species. The species which no more exist on the earth are known as extinct species. Example: tiger, wild buffalo etc.

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Answer 2

Step-by-step explanation:

Endangered species

The species which are at the verge of extinction and which are required to be protected and conserved are known as endangered species.

Example: tiger, wild buffalo etc.

Extinct species

The species which no more exist on the earth are known as extinct species

Example: dinosaurs