during an experiment the researcher measures a factor in both groups this measured factor is known as the

Name the organs of humanelemintary canal.

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

Natural selection changes allele frequencies because some survive and reproduce more successfully than others.