What accounts for genetic material from each of an organism's parents being present in sperm and egg cells?

a) regeneration of new cells

b) crossing over during mitosis

c) cytokinesis of new cells
2

d) crossing over during meiosis

Match the order of the levels of organization in nature with the correct description. example: atoms are fundamental units of matter= level 1levels- 2,3,4,5,6,7,8.now what levels are these? population consists of organismscells consist of moleculesecosystems consist of communities interacting with there environmentmolecules consist of atomsthe biosphere consist of all ecosystems on earthcommunities consists of populationorganisms consist of cells