Answer: y = x
Explanation:
Looking at the graph, we can retrieve two coordinates from the range we are given: (0, 0) and (5, 5). Because 1900 is the starting x-coordinate of the graph, we can represent it at 0.
You can find the slope of this equation using this formula:

Your slope is equal to 5/5, or 1.
Because the function's y-intercept is equal to 0, there is no need to add anything to the function.
The gradual abundance of oxygen (by product of photosynthesis) made it possible for aerobic organisms to grow more and evolve.
Hope that helps!
Answer:
With a warm front, boundary between warm and cold air is more gradual than that of a cold front, which allows warm air to slowly rise and clouds to spread out into gloomy, overcast stratus clouds. Precipitation ahead of a warm front typically forms into a large shield of steady rain or snow.