Mendel began each of his experiments by: A. crossing pea plants from different generations.
B. crossing two pure lines of peas.
ООО
C. crossing two heterozygous pea plants.
D. crossing peas with a haploid chromosome number.

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