2.
Toads reproduce using external fertilization. Besides the toads themselves, which of the
following must be present during external fertilization?
A. trees
B. tadpoles
C. sunlight
D. water

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in a chemical reaction, the atoms and molecules produced by the reaction are called products. no new atoms are created, and no atoms are destroyed. in a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.