Which of the following are not extremophiles? a. pompeii worms b. bacteria in boiling hot springs c. fish living in open oceans d. fish living in water below freezing

The correct answer would be c. fish living in open oceans.

Extremophiles refer to the organisms which are able to survive in extreme conditions such as high temperature, high pressure, high salinity et cetera.

For example, Pompeii worm is an extremophile which is usually found at hydrothermal vent, Picrophilus torridus is a thermoacidophile that is, it can survive in hot and acidic conditions et cetera.

Fish living in open oceans do not face such extreme conditions, thus, they are not the example of extremophile.

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%

measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.