Mention the 10 Phylla of plants.
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1. Phylum Heptophyta- Non Vascular Plants (Bryophytes)

Common Name: Liverworts

Estimated Number of Species: 9,000

2. Phylum Anthocerophyta- Non Vascular Plants (Bryophytes)

Common Name: Hornworts

Estimated Number of Species: 100

3. Phylum Bryophyta- Non Vascular Plants

Common Name: Mosses

Estimated Number of Species: 15,000

4. Phylum Lycophyta- Vascular Plants (Seedless Vascular Plants)

Common Name: Lycophytes

Estimated Number of Species: 1,200

5. Phylum Pterophyta- Vascular Plants (Seedless Vascular Plants)

Common Name: Pterophytes

Estimated Number of Species: 12,000

6. Phylum Ginkgophyta- Vascular Plants (Seed Plants: Gymnosperms)

Common Name: Ginkgo

Estimated Number of Species: 1

7. Phylum Cycadophyta- Vascular Plants (Seed Plants: Gymnosperms)

Common Name: Cycads

Estimated Number of Species: 130

8. Phylum Gnetophyta- Vascular Plants (Seed Plants: Gymnosperms)

Common Name: Gnetophytes

Estimated Number of Species: 75

9. Phylum Coniferophyta- Vascular Plants (Seed Plants: Gymnosperms)

Common Name: Conifers

Estimated Number of Species: 600

10. Phylum Anthophyta- Vascular Plants (Seed Plants: Angiosperms)

Common Name: Flowering Plants

Estimated Number of Species: 250,000

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.

a fossil fuel is a fuel formed by natural processes, such as anaerobic decomposition of buried dead organisms, containing energy originating in ancient photosynthesis.[1] the age of the organisms and their resulting fossil fuels is typically millions of years, and sometimes exceeds 650 million years.[2] fossil fuels contain high percentages of carbon and include petroleum, coal, and natural gas.[3] other commonly used derivatives include kerosene and propane. fossil fuels range from volatile materials with low carbon to hydrogen ratios like methane, to liquids like petroleum, to nonvolatile materials composed of almost pure carbon, like anthracite coal. methane can be found in hydrocarbon fields either alone, associated with oil, or in the form of methane clathrates.

the theory that fossil fuels formed from the fossilized remains of dead plants by exposure to heat and pressure in the earth's crust over millions of years was first introduced by andreas libavius "in his 1597 alchemia [alchymia]" and later by mikhail lomonosov "as early as 1757 and certainly by 1763".[4] the first use of the term "fossil fuel" was by the german chemist caspar neumann, in english translation in 1759.[5]

in 2017 the world's primary energy sources consisted of petroleum (34%), coal (28%), natural gas (23%), amounting to an 85% share for fossil fuels in primary energy consumption in the world.[6] non-fossil sources in 2006 included nuclear (8.5%), hydroelectric (6.3%), and others (geothermal, solar, tidal, wind, wood, waste) amounting to 0.9%.[7] world energy consumption was growing at about 2.3% per year. in 2015 about 18% of worldwide consumption was from renewable sources.[8]