Answer:
Option (1)
Explanation:
The primitive atmosphere of the earth was comprised of little or no oxygen. After the appearance of the first primitive organisms in the oceans and other water bodies, they started to use the water as a source of electron that helped them to carry out the photosynthesis process. The primitive organisms such as cyanobacteria were able to carry out this process, in the presence of sunlight, CO₂ and water, and in return, it produced the oxygen, mostly in the form of dissolved oxygen.
Thus, the correct answer is option (1).
N a market economy, consumers decide the answers to the three questions. They do this by their choices of what to buy. No one tells companies what to make -- they make whatever they think will sell. If they choose wrong, they go out of business.
The correct answer for the question that is being presented above is this one: "DXY Orbital." T<span>he label for the orbital shown here that indicates the type of orbital and its orientation in space is DXY orbital. P orbitals on the other hand are like single dum-bells and is oriented along x, y, or z axis.</span>
Answer:
Geography is divided into two main branches: human geography and physical geography.
Human Geography
This is one of the major branches in geography and it mainly covers studies of the human race.
Physical Geography
Physical geography is a major branch of the science of geography, and it mainly deals with the study of the natural characteristics of the Earth.