Organisms that can interbreed and bear fertile offspring are considered to be in the same
a. family.
b. class.
c. species.
d. order.

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:

it's c. (to reduce the greenhouse effect/carbon gasses)