Answer:
The correct answer is: organism.
Step-by-step explanation:
If the seeds are the offspring of a mature plant, which is a living organism, that means that they are organisms on their own as well. Just because the seed hasn't grown into a mature plant, it doesn't mean that is not alive. Seeds are actually organisms with dormant cells - waiting for the moment they encounter appropriate conditions for them to grow and perform typical cellular functions as mature plants do.