Plants and animals provide food for humans. Plants cycle the air for humans too.
If reproduction didn't exist, all species would eventually go extinct.
The air gap is filled with gas which increases the insulation between the glass pieces. Double glazed windows are highly efficient, reducing your heat loss or gain by up to 30% when compared to single-glazed windows.
<span>When the idea of evolution originated, scientists used objects that were similar. An example being given would be that of monkeys and humans were much more alike than dogs and monkeys. When scientists realized how minor those differences were, it enabled them to study how close those relationships actually were. Public knowledge grew about cells and DNA; scientists also knew how it could be used to determine similarities and differences in proteins in humans and animals. Tying all of these methods together will create an evolutionary map.</span>
