Hypothesis: 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.
If the type of food available to birds changes, then over time the birds with beaks unable to eat the changed food will die off, and only the birds with adapted beaks will live on and pass their features onto their offspring
the correct answer is D) The photovoltaic cells absorb light energy from the sun, then the energy is stored as chemical potential energy in the battery where it can be transferred to electrical energy.
