There are four major 1) viruses, fungi, and protozoa, They 2) sick Bacteria are one-cell creatures that can 3) infections Some infections bacteria cause include sore 4) ear infections, tooth decay and pneumoni There are also good bacteria that live in our intestines and 5) us use the nutrients in the food we eat Scientists use some bacteria to 6) When viruses get inside people's bodies, they can 71 medicine: and make people sick Viruses causeScientists use some bacteria to 6) When viruses get inside people's bodies, they can
7)
medicines,
and make people sick. Viruses cause
chickenpox, measles, flu and many 8)
diseases
Fungi are plant-like organisms made of many cells. They love to
9)
10)
in damp, warm places. Most fungi are not
but they can cause athlete's foot
Protozoa are one cell organisms that 11)
spread
diseases through water Some protozoa cause intestinal infections
that 12)
to diarrhoea, nausea and stomach ache
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