Which of the following technologies is useful for locating schools of commercial fish? a) sonar and satellite imagery b) water sampling c) computer modeling d) magnetic resonance imaging

Sonar and Satellite Imagery

Explanation:

Unlike the other one, this is the correct one. This is the 2020 standard for technologies locating schools of commercial fish.

1. filamentous rotating structures which porvide motility, may be singular, paired or scattered.

Explanation:

"Bacterial flagella are helically shaped structures containing the protein flagellin. The base of the flagellum (the hook) near the cell surface is attached to the basal body enclosed in the cell envelope. The flagellum rotates in a clockwise or counterclockwise direction, in a motion similar to that of a propeller."

Reference: Britannica, The Editors of Encyclopaedia. “Flagellum.” Encyclopædia Britannica, Encyclopædia Britannica, Inc., 2019