The very large muscle which covers the top and sides of the skull from occipital bone to eyebrows:

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 answer is c.) there is a warm front in region a and a stationary front in region b.