In a chromosome, the two copied dna strands are joined at a point called the chromatid.  true false

The earth's polarity has switched many times through history as evidence by what wh the earth clorets he has switched many times throughout history as evidence by what

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?

Identify the various levels of atmosphere. troposphere mesosphere exosphere stratosphere thermosphere