True.
The earth is made of several subsystems or spheres that interact to form a complex and continuously changing (dynamic) state that is termed as the earth system.
Even though the earth system is a closed system, it self regulates through the subsystems such as the water cycle and carbon cycle.
The earth system is characterized by numerous overlapping cycles in which matter is recycled over and over again. Cycles involve multiple spheres and systems interactions. Humans impact and are impacted by the cycles in various ways.
The answer is 251.0 Hope I helped
RNA contains cytosine and uracil as pyrimidine. DNA has cytosine and thymine.
The burning of fossil fuels can cause smog and acid rain.
