Which organelle is labeled A?

My question says on my assignment. read the following scenarios and decide which of the properties of life are being described. the first one is. katherine stopped on the way to school to grab some donuts. 2. because a dog cannot sweat, it has to pant in order to stay cool. 3. an elephant trun had no bone but 4,000 muscles. i have no idea what i am supposed to anwer. i can't find the answer in my notes or book that i can understand anyway

At which location in earth’s interior does the top density continue to increase as thickness decreases?

How are mutations continually being generated in a population (what are some of the causes of mutatuions? ) explain