The hose is attached to a vacuum pump. When the air is pumped out of the jar you will be able to see the clock but you will not be able to hear the alarm from the clock.

A. Mechanical waves require a medium for travel; electromagnetic waves do not.

B. Electromagnetic waves require a medium for travel: mechanical waves do not.

C. Electromagnetic waves require a medium for travel, mechanical waves do not.

D. Mechanical waves require a medium for travel; electromagnetic waves do not.

PLZ EXPLAIN WHY IT IS CORRECT!!!

sheep is a herbivore animal whereas grasshopper belongs to the class chordates but both of them feed on greens.  

if grasshopper and sheep feeding on a pasture land, i do not think both of them will have any impact on each other. however, the number of the species can make difference. since sheep feed on greens, there is a possibility there left no pasture land for the grasshoppers or they may get extinct.

c. live where it’s cold and icy

a unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring.