________ is an instrument used in determining the directions of movement of clouds.

A. Communication
B. Weaving
C. Food indudtry
D. None of these

Optical fibers are used most often as a means to transmit light between the two ends of the fiber and find wide usage in fiber-optic communications, where they permit transmission over longer distances and at higher bandwidths (data transfer rates) than electrical cables.

A. Bat
B. Humming Bird
C. Crimson Sun Bird
D. Cardinal Bird

hummingbird which move back slightly include flycatchers, warblers, egrets and herons using the fluttering method. The only bird which can fly backwards and forward without relying on the wind is the hummingbird.