Imagine that you are a Peruvian scientist studying the effects of El Niño. Your hypothesis is that El Niño is having negative biological effects on the marine
environment along the Peruvian coast. What kind of data would you collect to test
your hypothesis?

the answer is a or when it says crossing over

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.

very

you're crazy : )