Bioluminescence in the marine environment is:

a. Widespread amonth both invertebreates and the fishes?
b. limited to plankton and survace dwelling organisms?

It is widespread.

Scroll down to
Organisms that bioluminesce
here:
http://en.wikipedia.org/wiki/Bioluminescence#Organisms_that_bioluminesce

Thanks

What is the total amount of dissolved material in water

To find the total amount of dissolved material in water, you can use a method called water analysis. This involves collecting a water sample and testing it for various parameters such as ions, minerals, and organic compounds.

There are several techniques and instruments used for water analysis, depending on the specific type of dissolved material you want to measure. Common methods include titration, spectrophotometry, atomic absorption spectroscopy, and chromatography.

To get an accurate measurement, it's important to follow specific protocols and use calibrated equipment. In some cases, you may need to send the water sample to a laboratory for analysis by trained professionals.

Keep in mind that the composition and concentration of dissolved materials in water can vary greatly depending on the location and source of the water. Factors such as pollution, geological characteristics, and human activities can all influence the amount of dissolved material in water.