Answer:
A system that uses the sun's energy without requiring mechanical devices (pumps or fans) to distribute the collected heat are called solar system while radiator system uses fuel to heat the water. in active solar heating system, the SUN's energy used to heat water.
Answer:
The earth surface is getting hotter because of global warming
Explanation:
Answer:
A) 1000
Most viruses are 1000 times smaller than the average cell