4 marks question
1. A frog has antagonistic muscles called the flexor and extensor muscles.
2.Frog has long, strong and muscular hind legs which are adapted for jumping.
3. Flexor muscle contract to flex the leg / prepare for jumping.
4. Extensor muscle contract, flexor muscle relaxed causes the hind legs to straighten suddenly.
5. The force produced exerted to push the frog
6. upwards and forward
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