25 POINTS HELP ... Select the correct answer from each drop-down menu. Complete the sentences to explain how photosynthetic organisms changed our lives on Earth.
The 1(carbon dioxide) 2(oxygen) 3(water vapor) 4(nitrogen) in the atmosphere that all living beings depend on was generated by cyanobacteria during the Archaean and Proterozoic eras. The presence of this substance is what makes 1(the water cycle) 2(visability) 3(photosynthesis) 4(combustion) possible on Earth.

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

the dark variety, as they are not visible on the dark tree barks

explanation:

the answer is c. it will give up it's valence electron to the other atom.

its temperature is increasing. this causes molecular vibrations to increase.