3. What changes occurs in Amoeba to survive in adverse conditions?​

Cyst formation takes place in Amoeba by the process of multiple fission in adverse condition. When there is no availability of food, cyst formation takes place.

Explanation:

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after receiving a stimus, the sensory receptors send(s) signals to the appropriate area of the body.  

the must be sensory neurons.  

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if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.