The simplest optical microscope<span> is the magnifying glass and is good to about ten times (10X) magnification. The compound </span>microscope<span> has two systems of lenses for greater magnification, 1) the ocular, or eyepiece lens that one looks into and 2) the objective lens, or the lens closest to the object.</span>
Answer: The correct answer is-
C.They replaced carbon dioxide with oxygen in the atmosphere.
Cyanobacteria ( also known as blue green algae) is a large phylum of bacteria that is capable of synthesizing its own food using carbon dioxide and water in the presence of sunlight ( photosynthesis).
They contain a green pigment called chlorophyll that absorbs energy from sunlight and helps in the formation of food ( glucose). They release oxygen as a byproduct in the atmosphere.
As these organisms utilize carbon dioxide ( that is present in the atmosphere) to give oxygen in return, therefore, they affected early atmosphere of Earth by replacing carbon dioxide with oxygen.
Thus, option C) is the right answer.
For the answer to the question above for property damage, one example we could give is buildings or houses. Erosion decreases the value of this properties because the materials like metal are oxidizing and rust overtime and the structure's strength is decreasing over time. As for damage to crops. the land's nutrients decrease overtime too. Which means the crops can get fewer nutrients from the soil in order to perform Photosynthesis.
The long-term effects of this things on humans are things get riskier. Like a car. A 20-year-old car isn't the same as a brand new car in whatever ways. The brand new cars are safer because the materials that are used there are newer than the old car and they are more reliable. Same for humans. A 5-year old's health is not the same as a 50-year-old's health.
Answer:
An ore is mined so that Metals can be removed from it.
Explanation:
An ore is ought to be mined so that it can be refined, the waste elements are removed from it, and the valuable elements, such as metals are kept.
Ores if not mined are of no use they are a pile of dirt until processed and therefore, to bring out the real value of an ore, it has to be mined and processed
There are many ways in which they are different but one of the important one is :
in photosynthesis, CO2 is used and O2 is released while in cellular respiration O2 is taken and CO2 is released !