Large quantities of nitrate and phosphate plant nutrients from runoffs can cause a harmful ___________________________________ that can be red,brown,or green.

Which synthetic substance acts as an endocrine disruptor? 

A)  high-fructose corn syrup 
B)  caffeine 
C)  Bisphenol-A 
D)  ethyl alcohol

The ocean current known as the Gulf Stream in the Atlantic Ocean is a:

A) warm current flowing north from the equator
B) cold current flowing north from the equator
C) warm equatorial current flowing east into the Gulf of Mexico
D) deep-ocean current that controls fish abundances in the southern hemisphere
E) none of these