A scientist shines low levels of ultraviolet radiation on a dish containing colonies of ruby-red bacteria. He then makes several replicate plates from this dish over many generations. He finds that in addition to the ruby-red color, there are also pink, orange, and yellow bacteria. Which of the following is the best explanation for these findings?
A.
One bacterial colony changed its color to better blend in to the media.
B.
Mutations occurred in the gene for color and were passed on to successive generations of bacteria.
C.
The scientist selected new types of bacteria by making plates of successive generations over time.
D.
Natural selection produced the changes in the bacterial color.

answer: - few nutrients

high pressure

low temperatures

explanation: 1. few nutrients:   open-ocean zone is located way far from the land, which is the main source of the essential nutrients.2. high pressure: pressure increases by 1 atmosphere for every 10 meters increase in depth.3. ample sunlight: a large fraction of the sunlight is reflected back to the atmosphere from the sea surface. 4. varying salinity: below the thermocline, the water is isolated from the atmosphere so the salinity remains stable over the year.5. low temperatures:   the temperature of open-ocean zone ranges from a low of -2°c to an average of 17°c

carbon atoms, hydrogen, oxygen, and nitrogen.

bradykinin is a physiologically and pharmacologically active peptide of the kinin group of proteins, consisting of nine amino acids.