instruction:
In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.
question:
Question: What are intervertebral discs made of? Answer: fibrocartilage
answer:
Intervertebral discs are made of fibrocartilage.


question:
Question: What do you call a group of organisms of the same species that live in the same area? Answer: population
answer:
You call a group of organisms of the same species that live in the same area a(n) population.


question:
Question: What's the term for the gradual progression from simple plants to larger more complex ones in an area? Answer: primary succession
answer:

What's the term for the gradual progression from simple plants to larger more complex ones in an area?