Why do plasma cells derived from b cells have extensive endoplasmic reticulum?

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.

Guard cells control which event? the growth of plants capture of solar energy gas exchange in leaves water absorption in roots

Describe the layers of the suns atmosphere?