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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