I would say true. I say this because there have been times where scientists find out that there are better ways of performing experiments, or found that certain materials work better for certain tasks. (Especially true in medicinal fields!)
Answer:
They are usually found in the center and they are called embyro sacs.
Explanation:
You are correct they will have 24 chromosomes
we would loose the capability of curing every simple sickness that antibiotics can cure and will eventually die from sickness and disease