Why are there so many different shaped beaks in finches

Beaks changed as the birds developed different tastes.

Explanation:

Fruits, seeds, or insects picked from the ground or cacti have affected their evolution.  Long, pointed beaks made some of them more fit for picking seeds out of cactus fruits. Shorter, stouter beaks served best for eating seeds found on the ground.

Because of evolution. If a bird needs to get things deep in the dirt, their beaks would be longer. If they are getting big berries, there beaks will be bigger. If their foods are softer, their beaks will be weaker, etc.

Explanation:

the answer is yes, they are born/created, then they grow to their limit then produce offspring, then die.

the transfer for conduction is the heat transfering from the liquid to the spoon

the transfer for convection is the heat rising from the liquid to the air

the transfer for radiation is the heat going through the sides of the cup and to the air

at least that is what i would do