Vertebrates, or chordates, are all animals that have to d

Which statement best describes a keystone species? o a. it has littlelmenetic variation. it has an extremely high population. 0 b. 0 c. it remains unaffected by all environmental changes. od. it has a strong influence on the ecosystem. 0 e. it's the first species to populate a new ecosystem.

Ais a landform that is formed at the mouth of a river from the deposition of sediment carried by the river as the water flows.

Which was most likely an effect on society that resulted from improvements in blood handling during world war i and world war ii?