More scientists believe the extinction of mesozoic life was caused by what?

Many believe that the cause of the K2 extinction event (The end of the Mesozoic era) was caused by a large meteor impact in the modern day Yucatan Peninsula. The meteor created such a large impact that it launched enough dust and other debri into the atmosphere to block out light from the sun, causing plants to die, which caused a chain reaction leading to the decline of most dinosaur species. Hope this helped!

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: