Which element has the smallest mass on the periodic table? *
O
H
Pb
He
Mg

Which of the following compounds does not contain molecules? question 2 options: co2 h2 nacl h2o

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.

The grooves or folds of the brain are called