Answer:
Principle of cross-cutting relationships
Explanation:
The geologic principle that will provide the most profound explanation to this problem is the principle of cross-cutting relationships.
It states that "features that cross-cuts rocks are younger than the layer they cut through".
Some of these features are intrusions, faults and joints.
The logic behind this reasoning is that without the rock in place, the cross-cutting event wouldn't have been recorded.
We can liken this to a fracture on the wall of a building. If the wall is not erected, there wouldn't be any fracture. Therefore, the fracture is far younger than the wall.
Answer: Cyanobacteria, oxygen
Cyanobacteria also known as Cynophyta and blue green algae. It is a phyllum of bacteria that produces it's own food like plants by the process of photosynthesis. It is found in freshwater lakes, damp soils, oceans, moistened rocks and even in animal fur. The purple sulfur bacteria belongs to the group of Proteobacteria. It is an anaerobic bacteria. It is found in hot springs, and stagnant water. It is a photosynthesizing bacterial strain like Cyanobacteria but it does not utilize water to be reduced in the photosynthesis process like in Cynobacteria, to produce oxygen.
Hence, only the <u>Cyanobacteria</u> are capable of releasing <u>oxygen</u>.
