What is the function of the organelle labeled a in the diagram?

Aperson with age is more likely to catch diseases that healthy people usually don’t catch.what are these infections called?

Cells destroy body cells infected by a virus or bacteria. killer t t memory t none of the above

Johnny rode his bike 4 blicks down the street to his friend's house once he got to his friend house and realized he could not cone out to play he turned aroubd and went back home.what is displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point