water, air or sunlight... which was the most importance factor in the evolution of life on earth?

Answer 1

Certainly not air, because it was only the first life forms which began to change the atmosphere from one that we could not have breathed into the one that we do.

Probably not sunlight, and most probably water. Evolutionary and biological scientists can imagine ways for life on earth to have evolved using different energy sources from sunlight - check the "hydrothermal vents" answer - but not ways for it to have evolved without liquid water.

Answer 2

Hmmm. Sunlight is the energy source that makes all this happen. There is a small group of organisms that derive their energy from earth's heat, but they can't get too far from these geysers and lava flows deep within the ocean. The air in the sky today was created by the life that was on the planet a long time ago. Before, the air was actually made of methane, and then an evolutionary breakthrough was that energy from the sun could be more efficiently converted into chemical energy by releasing a full molecule of oxygen into the air. This oxygen killed off many of the bacteria that released it as a byproduct, but some adapted to survive in an oxygen environment. Water is a little more difficult. It is necessary. Before the presence of liquid water on earth, life simply didn't exist. The primordial soup theory says that a racemic mixture, containing 13 of the 22 amino acids used to synthesize proteins in cells, had formed from the highly reduced mixture of methane, ammonia, water vapor and hydrogen. So more chemicals than just water are necessary to get life going. However, the sun is a must. Energy from the earth alone will not be enough to get things started up, so I vote the sun.

Answer 3

I'm going with water, since all organisms are based on water, and the chemistry of biology needs a medium in which to happen. Not all ecosystems depend on the Sun; some use geothermal energy. Air is completely unnecessary, as for the first 4 billion years of evolution nothing lived in it.

Answer 4

All are required for life. It doesn't make any sense to label one as more important than the other. Evolution is a different subject, however. Evolution requires random mutations in DNA, which is partially produced by radiation from the sun. Other sources are cosmic rays. So, in short, the answer is sunlight (if you include radiation from the sun).

Answer 5

sunlight is important

according to earliers science 5million years ago

earth was covered by huge cloud which stops sunlight

for more than 300-400 years and which destroy dynossoir

Answer 6

we need water to drink and to grow crops for food... air to breathe... sunlight so that food can grow... wow dont know

Answer 7

Maybe hydrothermal vents.

Answer 8

all of the three. . . they are all needed for the chemical reaction that made bioms become complicated