Which situation allows for evolution during gene duplicate?
a. a mutation occurs in one copy of the original gene
b the original gene performs the same role as the mutated gene
c the original gene never duplicates
d. existing genes. are copied over generations

What is the identity of the planets?

Which best describes the nucleus of an atom a. it is where all of the particle s of the atom are located b. it is the negatively charged part of the atom c. it is where the electrons and the protons are located d. it is the part of the atom with the greatest mass

Which of the following is a period in the paleozoic era? devonian cambrian permian all of the above