Keeping doors and windows closed the environment because

a: it conserves heat energy in winter and cool air in summer

b: it eliminates residential dust from entering the atmosphere

c: it is an easy and important fire safety action

d: it prevents pollutants from entering the home

fas

"griffith's experiment discovering the "transforming principle" in pneumococcus bacteria. griffith's experiment, reported in 1928 by frederick griffith, was the first experiment suggesting that bacteria are capable of transferring genetic information through a process known as transformation." - griffith's experiment.

every el niño cycle is different. every year.