Answer:
I think it is sugar, as it is using sugar to grow.
Answer:
The child's father has type O blood.
The reason for why celery stalk firms in water is because of its hypotonic environment and the salt content transfers into the celery stalk which makes the cell firm and significantly bigger.
Your answer will be Physical evidence it give people the chance when they find something that's a important like a weapon,or hair it gives experts the chance to see if they can figure out what happen so they can catch the guy who caused it to happen.
So your answer is Physical Evidence.
