Strawberry sells bicycles. One bicycle sells for $85, and the cost to produce a bicycle is $65. What is strawberry's return on investment (roi)?.

ANSWER: b. Stratosphere and Thermosphere

EXPLANATION: The Stratosphere and Thermosphere are two main important layers of the atmosphere of Earth. Thermosphere is the major layer amongst all the layers and Stratosphere is the second major layer in the atmosphere. The thermospheric temperature increases as and when it absorbs the radiation of the sun. The stratosphere contains the Ozone layer which helps absorb the solar radiation and also the harmful UV rays.