Sister chromatids present at metaphase ii might not be genetically identical to each other because

Which best explains why there are 64 possible codons in the genetic code and only 20 amino acids that make protiens of living organisms on earth

In iceland, the mid atlantic ridge runs through the center of the contry. what can you conclude about the apperence of iceland many thousands of years from now?

Which of the following is not a food produced in rainforests? a) coffee b) cocoa c) avocados d) wheat