Without a control group there wouldn’t be any basis for knowing if a result is due to the variable being tested
Mutation is the only evolutionary mechanism that does little to change allele frequencies.
Answer:
Air seal you attic so you keep outside air out and inside air in, get new energy efficient windows, replace old appliances so they take up less energy, keep your water heater warm so that you use less energy by heating up water, switch from incandescent lights to fluorescent lights. Add solar panels.
Hope this helps
Have a nice day((:
Explanation:
The correct answer Is true