Based on what you know, how would you improve Jose's running experiment? He should try another running field.
He should take another lap.
He should try another pair of running shoes.
He could improve his running experiment using repetition.
Which is correct?

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.

thats not a question

your answer is going to be physical weathering

the answer is c because it is most logical.