The correct answer is - cyanobacteria.
The atmospheric oxygen came from the cyanobacteria. These were one of the earliest living organisms on Earth. The cyanobacteria was using photosynthesis in order to create its own food. The photosynthesis process requires sunlight, carbon dioxide, water, and oxygen. The oxygen is mostly released as a waste product from the process of photosynthesis, thus the cyanobacteria were literally releasing oxygen that was ending up into the atmosphere. As more and more cyanobacteria there were across the planet, more and more oxygen they were releasing into the atmosphere, slowly changing the composition of the atmosphere, and setting the basis of it as we know it now.
The slope of the line is m = -1
Answer:
An outcrop consisting of several horizontal sedimentary rock layers represent a vertical time-series of geologic events. The textures of each sedimentary layer tells us the environment that was present at that location when the layer formed.
Explanation:
Consider a time when mars is in the middle of one of its periods of apparent retrograde motion. during this time, mars appears <u>brightest</u> in our night sky and crosses the meridian around <u>midnight</u>.
Answer:
y=2x
Explanation:
In order for y to be 6, then x has to be half that value.
