why is the phytoplankton (algae) species, Pseudo-Nietzsche, harmful to organisms that live in the Pacific?

Harvey kept a balloon with a volume of 348 milliliters at 25.0˚c inside a freezer for a night.  when he took it out, its new volume was 322 milliliters, but its pressure was the same.  if the final temperature of the balloon is the same as the freezer’s, what is the temperature of the freezer? the temperature of the freezer is  kelvins.

How many grams of co(g) are there in 74.5 ml of the gas at 0.933 atm and 30o c?

What substance has a mass of 9.5g and volume of 2.1cm^3