Black widow spider
- Some insects are harmful beings .
- The poison of the black widow spider causes unbearable pain.
- It stiffens the muscles of the abdomen and causes death to some of the victims .
- Some kinds of mosquitoes carry germs that cause diseases such as malaria , yellow fever and sleeping sickness .
- The mosquitoes pick up the germs and pass them on to the people they bite .
- Flies play a part in spreading such diseases as cholera , dysentery and typhoid fever.
- All insects which carry germs and spread diseases live and breed only in dirty places.
- So we can prevent such diseases if we keep our houses free of dirt.
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