Which happens during crossing over? A. Two sex cells join together and combine DNA.

B. Genes are exchanged between two alleles.

C. Genes are exchanged between two egg cells.

D. Chromosomes line up randomly during metaphase I.

How does deforestation affect the water cycle? a. it increases the amount of runoff b. it increases the amount of percolation c. it increases the amount of transpiration d. it increases the amount of precipitationa it increases the amount of runoff

The main ingredient of magma is a pahoehoe. b silca c dissolved gases d obsidian

Which of the following matches the organisms described with the correct domain? a. archaea--multicellular, eukaryotic organisms that do not have cell walls b. eukarya--single-celled and multicellular organisms, with a defined nucleus and a variety of nutritional sources c. bacteria--unicellular, eukaryotic organisms with cell walls that do not contain peptidoglycan d. bacteria--unicellular, eukaryotic organisms that always lack cell walls