1- iron is very important in diet. it helps children grow and increase resistance to disease. it is particularly important for young women, pregnant women, and old people. we all need a lot of iron in our diet.
a lack of iron makes people anaemic and causes fatigue and depression. good sources of iron are liver, lentils, whole grains, green leafy vegetables, egg yolk, and molasses.
when you are planning meal for someone who is ill or who has a bad cold, you should try to include some foods with iron in them.

2- it may be possible one day for men to live on the planet mars. mars may have had a climate likes ours many millions of years, and the inhabitants may have ruined it with pollution, just as we may be doing in our town.
if we succeeded in setting up a colony there, we may be able to grow plants and trees in artificial atmosphere, until it creates its own ecosystem, and gradually a new atmosphere might be created around the dead planet.

3- astronomers have found evidence of liquid under the surface that may be water, and if there is water, it is very possible that there might once have been some form of life on the planet.
the temperature on mars is very low and the only life form that might have survived in bacteria.
but the discovery of water on mars may be important in ways that we don't even know yet.