Plz answer
which of these is an environmental effect of burning fossil fuels and pesticides from farming?

smog

poisoning wildlife

increased temperature

use of large amounts of water

i am pretty sure it is a have not submitted the test yet plz answer soon.

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.