I belive the answer to the first one is no I would have to assume a habitual zone is one area on a planet. for example, an air conditioned building vs. the Savvanah dessert. However I am not sure maybe other answers will help more on this one. Sorry.... Earth-like planet would of course need water, plant life, animals, oxygen, fossil fuels etc. A challenge we would face on a travel to another liveable planet: do we have engough transportation? engough fuel to make it? How long can we live on this planet? Who or what else is present here? etc. Yes I do think they should discover a planet with earth like qualities befor investing in tools to get us to them. So money is not wasted. (make sure to put this into your own words )
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Many factors including farming method, where food is grown, what pesticides and fertilisers are used, what is fed to our livestock, and so on, affect the environmental impact of the food we buy and eat. ... Water and air pollution, loss of wildlife, and of natural habitats all result from food production.
I think it's B 34 so it's not c or a :3
