Answer:
"U"-shaped, with peaks at the low and high extremes of beak size; disruptive selection
Troposphere
Stratosphere
Mesosphere
Thermosphere
Exosphere
Flagella and cilia have the exact same structures and functions, and the names merely indicate how many are present on a given cell. When found singly or in a pair, these cell protrusions are called flagella<span>.</span>