What type of testing can reveal the precense of blood?

If the atomic mass of an atom is 34 and the atom contains 13 protons, how many neutrons does the atom contain?

Which of the following ocean acidification? are the most likely side effects of a ph less than 7.0 in the ocean b. more metal salts altering the ocean chemistry c. dissolution of the shells of marine organisms d. both a & b e. all of the above.

Which of these is an intensive property of a substance