The earth's atmosphere is divided into five layers. in the middle layer is where most foreign objects, such as meteors, will burn up as they enter the atmosphere. a) exosphere b) mesosphere c) stratosphere d) troposphere

bc blah

explanation:

bc blah

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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