4. Explain the difference between a scientific law and a scientific theory.

A scientific law is a relationship in nature that has been proved many times and there are no exceptions whereas

A scientific theory is an explanation for what has been shown many times.

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 unequal cytoplasmic division that  results  in  one egg  and three polar bodies ensures that a fertilized  egg has  ample nutrients  forits journey  to  the uterus.