There are two organisms with overlapping ranges and filling a similar niche. We find that where their niches overlap, there is twice the competition for resources. This leads to

It will lead to competitive exclusion .

Explanation:

Competitive exclusion occur when two organisms occupying a niche compete for resources and one organisms outcompete the other leading to the exclusion of the other one from the niche. This occur if two organisms have overlapping niches which tend to lead to pressure on the resources available as a result of competition, one organisms adapts, compete and thrive well and the other one is excluded.

not sure if this is what you'r looking for eubacteria and archaebacteria

all matter is made up of atoms

in any element all atoms are the same

elements in a compound are always in a constant ratio: apex