People with type o blood are considered "universal donors" for transfusions because people with type o blood are considered "universal donors" for transfusions because they usually have very strong red blood cells their red blood cells lack a and b surface antigens their blood lacks a and b antibodies their blood is plentiful in a and b antibodies

Most common blood type... Red blood donors

humans can cause extinction of a species through overharvesting, pollution, habitat destruction, introduction of invasive species (such as new predators and food competitors), overhunting, and other influences. explosive, unsustainable human population growth is an essential cause of the extinction crisis.

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i didn't have the answer choices , but i tried my best.

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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