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.

Classify the structures as homologous or analogous, depending on their structure and function.

Which organ controls breathing? lungs alveoli heart diaphragm

During crossing-over, a. genetic material is exchanged between nonsister chromatids, resulting in new combinations of alleles. b. nonsister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles. c. one homologous chromosome of a tetrad is exchanged with another tetrad, resulting in new combinations of alleles. d. sister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles. e. genetic material is exchanged between sister chromatids, resulting in new combinations of alleles.