Answer:
Oxygen levels were a lot lower then
Explanation:
2 billion years ago was before the Great Oxidation Event. The first oxygen-producing cyanobacteria did not exist before then. Without oxygen, oxidation cannot be common.
The following statements are correct about the displacement method:
1. It can only be used to measure the volume of solids.
2. It may yield incorrect result if the matter is soluble in liquid.
The displacement method is usually used to measure the volume of solids, especially irregular solids. It involves dropping the solid in water and measuring the volume of water that is displaced. The result may be affected if the solid is soluble in water.
By absorbing water which makes the cells turgid hence forth support the plant.
I believe the answer is habitat isolation! hope this helped :)
