Asubstance that can not be broken down into any simpler substances is called?

Aplant has an egg with 34 chromosomes how many chromosomes does a leaf cell of that plant have

Prior to the development of dna fingerprinting, blood type could be used to determine possible parentage. although it might prove someone was not a parent, it could not show if someone was positively the parent, only that he or she might be a parent. which of the following is a true statement that can be made about parentage based on blood typing?

What are levels of ecology and how can we remember them