Carbon monoxide ( CO ) is produced due to incomplete combustion of fossil fuels, metallurgical operations, automobile emission, cigarette smoking. CO combines with haemoglobin, produces carboxyhaemoglobin which impairs oxygen transport resulting in headache, decreased vision, cardiovascular disease, asphyxia.

If the carbon atoms fixed by producer already have passed through three species then the trophic level of the last species(i.e., third species) would be tertiary consumer.
Producers $\rightarrow 1^o$ consumers $\rightarrow 2^o$ consumers $\rightarrow 3^o$ consumers.

In the ocean, there are underwater sediments and sediment rocks of carbonate like in the form of limestone, dolomite etc. Thus, the correct answer is option C.

During photosynthesis, carbon dioxide is fixed to form carbohydrate by the dark reaction. The water molecules are broken down during the light reaction and release oxygen. Thus, the two process helps to maintain the balance of oxygen and carbon dioxide in the atmosphere.

The atomic no. of carbon is 6, The atomic no. of Boron is 5, The atomic no. of Magnesium is 12, The atomic no. of Silicon is 14.

In the Earths crust only 0.02% Carbon is found in the form of minerals like carbonates, hydrogen carbonates, coal and petroleum.

Lignite is brownish-black in color and has a carbon content around   60–70  percent, a high inherent moisture content sometimes as high as $75$ percent, and an ash content ranging from $6–19$ percent.

Anthracite is a hard compact variety of coal that has a high lustre. it has the highest carbon content, fewest impurities and the highest calorific content of all types of coal which also include bituminous coal and lignite.

There are four different types of coal

Peat is the first stage in the formation of coal. The heat and pressure from the top layers convert dead plants into a spongy brown material called peat.

High grade (HG) and ultra high grade (UHG) anthracite are the highest grades of anthracite coal. 

They are the purest forms of coal, having the highest degree of coalification, the highest carbon count and energy content and the fewest impurities (moisture, ash and volatiles).

Anthracite contains nearly 95% of carbon and is the purest form of coal so anthracite is the purest form of coal than any other forms.

Therefore, option B is correct.

Anthracite coal has highest amount of carbon and has clean burning properties. So, it is used as a household coal.

Anthracite has the highest percentage of carbon. Anthracite is the most metamorphosed type of coal (but still represents low-grade metamorphism), in which the carbon content is between 92.1% and 98%.

Bituminous coal is a dense sedimentary rock, usually black which is used primarily as household coal ,fuel in steam-electric power generation and to produce coke.

Peat found in the lowest depth of earth considering the other forms of coal.It also has the lowest percentage of carbon as compared to other forms.In other words, we can say that they are the youngest fossils.

Percentage of carbon present in an air dried sample of anthracite is 94-98%.

Bituminous or black coal is a soft coal containing a tarlike substance called bitumen. It is of higher quality than lignite coal and has low ash content so it is used as coal fuel in homes.

The order of carbon content is as follows:

Peat is a fuel consisting of spongy material formed by the partial decomposition of organic matter in wetlands such as swamps, bogs, and moors. Peat contains tree cellulose, more than $75$% moisture and less than $60$% carbon.

Coal is mainly found in beds of sedimentary rocks. But metamorphic rocks might sometime contain anthracite coal. But sedimentary rocks is the most important source of coal.

Other than Carbon (the main constituent), all the above mentioned elements are also present in coal.

Coal is available in four forms: Lignite, bituminous, anthracite and sub- bituminous. Anthracite is the highest ranked coal with the carbon percentage of above 87%. The carbon conten in lignite is 60-70%.  Tamil nadu is the largest producer of lignite coal.

Coal is available in 4 forms: Lignite, bituminous, anthracite and sub-bituminous. Anthracite is the highest ranked coal with the carbon percentage of above 87%. The carbon content in bituminous is 77-87%, in sub-bituminous is 71-77% and in lignite is 60-70%.  Lignite has the least carbon content and hence highest ash content.

• Peat has the carbon content of about 
• Anthracite has the carbon content of above 87%.

Anthracite coal has several important advantages not only over other forms of coal but over other energy-producing materials in general. Its most important advantage is, of course, the fact that it produces very little pollution or soot, making it a very clean source of heat. Anthracite coal is also very efficient because only a small amount needs to be burnt to produce a large amount of energy. Additionally, there is a large supply of anthracite, over six billion tons in the Appalachian Mountains alone, with more reserves found in the Rocky Mountains and the Andes.

Hence, the correct option is $C$

• Peat has the carbon content of about 40%-55%
• Anthracite has the carbon content of above 87%.

Fly ash is also known as pulverised fuel ash. It is one of the coal combustion products. The pneumatic system is employed for the disposal of fly ash. 

The substance that burns in the presence of oxygen and heat are called combustible substances whereas that do not burn are non-combustible substances. Elements such as carbon, hydrogen and sulphur present in the fuel makes it combustible.

The ash content of Indian coal is 30℅. Initially, in the 1970s it was 28℅. The quality of Indian coal is deteriorating over the years. Compared to other constituents also, ash content is more in Indian coal. 

The ash content of indian coal is 30℅. Initially in 1970s it was 28℅. The quality of Indian coal is deteriorating over the years. However Sulphur content of Indian coal is low about 0.5℅.

Coal is a black coloured sedimentary rock. When coal is grounded or broken into fine particles using a device called powdered coal mill, the resultant coal obtained is called powdered coal or pulverized coal. It is used in cosmetics, for the generation of electricity etc.

The calorific value of the coal depends upon its ash content. Less the ash content present, more is the calorific value of the fuel i.e. the fuel which has less ash content produces more energy on burning. Higher the calorific value, more is the efficiency of the fuel.

Bituminous coal or black coal is a relatively soft coal containing a tarlike substance called bitumen or asphalt. It is of higher quality than lignite coal but of poorer quality than anthracite and has a high heating (Btu) value . Formation is usually the result of high pressure being exerted on lignite. Bituminous coal is an organic sedimentary rock formed by diagenetic and sub metamorphic compression of peat bog material. Its primary constituents are macerals: vitrinite, and liptinite. The carbon content of bituminous coal is around 60–80%; the rest is composed of water, air, hydrogen, and sulfur.

Lignite is brownish-black in color and has a carbon content around 60–70 percent, a high inherent moisture content sometimes as high as 75 percent, and an ash content ranging from 6–19 percent compared with 6–12 percent for bituminous coal. The energy content of lignite ranges from 10 to 20 MJ/kg (9–17 million BTU per short ton) on a moist, mineral-matter-free basis.

Lignite is brownish-black in color and has a carbon content around 60–70 percent, a high inherent moisture content sometimes as high as 75 percent, and an ash content ranging from 6–19 percent compared with 6–12 percent for bituminous coal.

 A brownish-black coal with generally high moisture and ash content, and the lowest carbon content and heating value is lignite.

The process of conversion of lignite to anthracite is called coalification or metamorphism of coal.
Coal is classified on the basis of its rank. The rank of coal denotes its degree of maturity. Vegetable matter, under the action of pressure, heat and anaerobic conditions, gets converted into different stages of coal namely:
Wood → Peat → lignite → sub-bituminous coal → bituminous coal → anthracite.
Peat is the first stage in the formation of coal.

The calorific value of the fuel is also called as the heat value of the fuel. It is defined as the amount of heat released by burning of unit quantity of the fuel. The calorific value is an important characteristic of the fuel. The unit of measurement of the calorific value is the same as the energy.

The rank of coal is based on the degree to which the original plant material has been transformed into carbon.

The rank of coal is based on the amount of the plant converted into carbon.

Geothermal energy.

The mineral coal with given properties is Anthracite.