Question

please tell me number I

Answer 1

Answer:

the mass per unit volume of a substances is called

Answer 2

Answer:

people who are in favour of Zoos argued that they play an essential role in conserving rare animal species. conservationists estimate that at least thousand species of animals have been threatened during the last 20 years .Zoos have developed programs designed for preserving endangered species existing into the world.This involves looking after them well and breading them with captivity before reintroducing them in their natural habitat of wild animals with with lush green surrounding.Zoos do co-operate with each other into the success of their programs.

Explanation:

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