Which of the following statements is true?
a) when you add heat to a substance, its temperature usually increases.
b) when a substance gives off heat, its temperature increases.
c) heat and temperature are the same.
d) heat is transferred from a substance to the air surrounding it because both have the same temperature.

a. heat and temperature are two different things. Heat is hot, temperature is the average movement of particals in a substance. So when you add heat, the partical movement in that substance rises. NOW YOU KNOW.

prokaryotic cells do not have a nucleus in which the dna is stored in, it floats freely inside the cell.

eukaryote cells do have a nucleus in which the dna is stored in.

nucleic acid molecules are incredibly complex, containing the code that guarantees the four different nucleotide units comprise dna, the nucleic acid of interest to the genealogist. and one of four nitrogen-containing molecules called nucleotides