Answer:
DISADVANTAGES OF ELECTRONIC COMMUNICATION
The cost of development: Electronic communication requires huge investment for infrastructural development. Frequent change in technology also demands further investment. Legal status: Data or information, if faxed, may be distorted and will cause zero value in the eye of law.
Answer:
the gravitational force is proportional to the mass of both interacting objects, bigger objects will attract each other with a greater gravitational force. So the mass of either object increases, the force of gravitational attraction between them also increases.
Answer : Option B) A Comet
Explanation : A comet is mainly composed of rock, dust, ice and frozen gases like carbon monoxide, carbon dioxide, methane, and ammonia. It is sometimes called as dirty snowballs, recent studies on comets have revealed that the ice of a comet is covered by a crust. Comets also contain many variety of organic compounds as well as the gases.
Comets when comes near the sun while revolving around it loses some of the ice from its crust which gets vaporized by sun's heat.
A. by lowering the activation energy