We
have probably all experienced a situation where some of our food has gone bad.
Maybe we left it in our school bag or forgot to put in back in the fridge and
now it does not look so safe to eat.
What makes your sandwiches go bad when you leave them in
your school bag for a long time. It's because of things
called bacteria and fungi. Although it may surprise you, a mushroom is a type
of fungi, a type that's actually good to eat. Other types of fungi can be
poisonous and very bad for your health. They can be large or so small that you
don’t even notice it. Bacteria are very tiny
and you need powerful microscope just to see them. Some bacteria can make you
sick so it’s often a good idea to avoid dangerous bacteria when you can.
Although a lot of bacteria can be harmful, other types are used to help us make
foods like cheese and yoghurt. Perhaps the most
important thing fungi and bacteria do are to make things rot, returning all the
nutrients back to the earth. Without the help of bacteria and fungi, most of
our rubbish would be extremely difficult to get rid of, piling up constantly
and leaving a bad smell too.
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