Atubal ligation is a permanent sterilization procedure in which a woman's fallopian tubes are blocked or severed. which of the following explains how this process can be used to prevent pregnancies?
a: it prevents sperm from reaching the egg and fertilizing it.
b: it prevents the maturation of the follicle and the release of an egg.
c: it prevents a zygote from being implanted into the uterine wall.
d: it prevents the thickening of the walls of the uterus.

many phylogenetic trees have a single lineage at the base representing a common ancestor. a lineage that evolved early from the root and remains unbranched is called basal taxon. when two lineages stem from the same branch point, they are called sister taxa.

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explanation:

the generally accepted parts of modern cell theory include: all known living things are made up of one or more cells. all living cells arise from pre-existing cells by division. the cell is the fundamental unit of structure and function in all living organisms.