Which of the following is the best example of a way human lifestyles affect environmental systems?

using aerosol sprays causes acid rain by increasing ozone (o3) in the atmosphere.
agriculture causes water pollution when fertilizers and pesticides flow into lakes and rivers.
burning fossil fuels causes air pollution by decreasing water vapor in the atmosphere.
using radioactive materials causes ground pollution when chlorofluorocarbons (cfcs) seep into the ground.

Examine the two squirrel populations in the accompanying figure. the populations are separated by a geographic barrier. if after a long period of time the two species are no longer separated, what evidence is needed to determine if speciation has occurred? the figure shows two populations of squirrels separated by a geographic barrier. examine the two squirrel populations in the accompanying figure. the populations are separated by a geographic barrier. if after a long period of time the two species are no longer separated, what evidence is needed to determine if speciation has occurred? the figure shows two populations of squirrels separated by a geographic barrier. polyploidy is creating new species. the two populations are not interbreeding freely. hybrid offspring of the two populations begin to appear. one species will increase into a population size twice as large as the other species.

Which layer will become saturated first when rain falls?

Below are the three main organs that make up the plant body. what is the main function of the structure that is identified as b in the picture above? it anchors the plant.it produces food.it absorbs nutrients.it supports the plan