DNA is the correct answer but next time put answer choices so that people can better answer your questions. Thanks!
2 - Human refuse to stop polluting.
All other three are attempting to attack the problem of pollution.
Answer:
The trade winds or easterlies are the permanent east-to-west prevailing winds that flow in the Earth's equatorial region (between 30°N and 30°S latitudes). ... The weaker the trade winds become, the more rainfall can be expected in the neighboring landmasses.
Explanation:
Some plants also have large leaves to soak up nutrients and water, very helpful in this biome since it rains a lot. - Having some needles cased in wax, withstand cold temperatures and losing water from their leaves. - Having thin bark and shallow roots enables trees to withstand fire.