Answer:
it helps researchers sense things on earth. they are usually on aircraft or in a satellite.
Explanation:
it collects data from a different level detecting the energy from the earth. this energy comes naturally from the earth's surface. it even most commonly picks up reflected sun light (which is also a source of radiation)
There are between 189 and 196 countries in the world. This number is not fixed as some territories claim that they are countries, but are not widely recognized as such.
A is the correct answer.
They were formed to coordinate the interests of producing countries by regulating oil prices.
Their most common resource is petrol
