Answer:
A. humans going underwater and exhaling
Explanation:
The dissolved oxygen in water refers to the amount of oxygen that is found in water. However, there are various ways that oxygen dissolves in a body of water, these includes;
- Photosynthesis of aquatic plants: Oxygen is the waste product of the photosynthetic process carried out by green plants. Hence, when aquatic plants undergo photosynthesis, oxygen from them tend to dissolve into water.
- Diffusion from the atmosphere: Oxygen from air or atmosphere also dissolves in water
- aeration as water moves over rocks and debris, and from wind and waves
However, humans do not exhale oxygen but carbon dioxide, hence, it is not a source of dissolved oxygen
The answer is usefulness and profitability. An ore is a mineral or aggregate of minerals known as ore deposit and this can be mined or extracted like a metal. Hope this is the answer and would be of big help.
The large central vacuole would become dehydrated, because without enough water stored in it, there wouldn't be any turgor pressure (water pushing against the cell wall) to support the cell, which causes the plant to wilt.
