20. a comet's tail always points away from the sun because
dust; the solar wind pushes the particles away from the comet's head
ion; the solar wind pulls the particles towards the comet's head
dust; the solar wind pulls the particles towards the comet's head
ion; the solar wind pushes the particles away from the comet's head

Ion; the solar wind pushes the particles away from the comet's head

Explanation:

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: