D. It ensures continued existence of the orga 2. Which of the following does NOT belong to the group based on its mode
of reproduction?
A. Butterfly
B. Frog
C. Dog
D. Mosquito​

b..

is the correct one

explanation:

covalent bonds form as valence electrons are shared between two atoms. lewis structures and structural formulas are common ways of showing the covalent bonding in organic molecules. formal charge describes the changes in the number of valence electrons as an atom becomes bonded into a molecule.

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error