Answer:
a sense organ
Explanation:
this is because sense organs are part of nervous system
Exocytosis is ana ctive transport method and does not include any transport protein. whereas calcium ions pass through the membrane with the help of trans- membrane protein. These proteins make pores inside hydrophobic membrane and allow the ions to pass though it.
speed = distance/ time
Sally's speed = 200m / 39 s = 5.13 ms^-1