Can you give us the sentence
Plant populations change over time by growing in size and diversity. They generally are the first part of an ecosystem after lichens (the pioneer species) and cause an ecosystem to flourish and allow for animals to move in. I don't know if this is the answer you were looking for but it should give you somewhat of a base.
Answer:
Brown v. Board of Education
Answer: its B relations with the Native American Indians of the Great Plains
