The proportion of dissolved substances in seawater is usually expressed in
a. parts per hundred.
b. parts per thousand.
c. parts per ten thousand.
d. parts per million.

What is the name of this hydrocarbon?

Which characteristic of water it form droplets? a. low specific heat b. nonpolar structure c. high surface tension d. ability to dissolve substances

Which ocean zone has the most abundant primary producer and why a) the abyssopelagic zone ,du to the absence of light and cold water temperatureb) the bathypelagic zone, due to the absence of light and cold water temperaturec) the mesopelagic zone ,due to uts high light availability and warm water temperature d) the epipelagic zone, due to its high light availability and warm water temperature