To calculate the relative mass of an element you need to know both the mass of the individual isotopes of the element, and their
A percent occurrence.
Brelative charges.
C relative size.
D none of the above.

How can you keep track of variables in a science experiment?

Fan egg cell containing the (n+1) number of chromosomes combines with a sperm cell containing the (n) number of chromosomes, what is the result of this union? a) all future somatic cells of the organism will contain the (2n + 1) number of chromosomes. b) all future somatic cells of the organism will contain the (2n - 1) number of chromosomes. c) only certain somatic cells of the organism will contain the (2n + 1) number of chromosomes. d) all future somatic cells of the organism will contain the normal diploid number of chromosomes.

What do nitrifying bacteria convert