There is ____ oxygen on Mars. Scientists say we can take ____ to wear in Mars. The humans who go to Mars can carry ____ when they go outside. Scientists say that we will be able to grow ____ on Mars. However we need to change the environment first. First scientists will have to ____ Mars to make the planet suitable for growing plants and trees. Plants and trees need heat and ____ to grow. To get C02 scientists will plan to put ____ on Mars. The factories will produce C02, and the CO2 will increase the temperature.____ When the temperature increases, they will be able to ____ . When the temperature increases on Mars, the ice ____ on Mars will melt. When the temperature increases and the ice melts on Mars, the first ____ will come there to create places for them to live. Humans will build ____ for energy because there is a lot of wind on Mars. The houses the humans will live in are called ____. Another word for houses to live in on Mars is ____ . another word for changing the environment on Mars is ____ .

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