English, asked by kushagratandon09, 5 days ago

Write an autobiography on a fossil in 200-250 words.

Answers

Answered by sachinsky75
0

Explanation:

The rise in the levels of carbon dioxide (CO2) leads to substantial increase in temperature. It is because CO2 remains concentrated in the atmosphere for even hundreds of years. Due to activities like fossil fuel combustion for electricity generation, transportation, and heating, human beings have contributed to increase in the CO2 concentration in the atmosphere.

Global Warming: A Gradual Phenomenon

Recent years have been unusually warm, causing worldwide concern. But the fact is that the increase in carbon dioxide actually began in 1800, due to the deforestation of a large chunk of North-eastern American, besides forested parts of the world. The things became worse with emissions in the wake of the industrial revolution, leading to increase in carbon dioxide level by 1900.

Answered by ridishpreet
1

Answer:

Explanation:

1. Meaning of Fossils:

The word fossil is derived from the Latin verb ‘fodere’ which means to dig up. Thus, a fos­sil refers to anything that is excavated from the earth and not fashioned by man. Actually, the fossil refers to organic remains taken from the earth. So in common sense, fossils are the traces of the past life forms in the womb of the earth.

According to Arnold, the fossils are “the relic of some former living things, plants or animals, embedded in or dug out of the superficial deposits in past geological periods.” Schopf (1975) defines fossil as any specimen that demonstrates physical evidence of occurrence of ancient life.

2. Types of Fossils:

The fossils may be categorised in the follow­ing types:

1. Chemical Fossils:

These are the rem­nants of organic compounds p reserved in sedi­ments or in parts of fossilised structures without undergoing any or minimal change. These include amino acids, hydrocarbons, fatty acids, lipids, carbohydrates and the derivatives of other organic compounds.

The chemical composition of Pre-Cambrian rocks is an important criterion to establish the biogenicity of putative unicellu­lar or multicellular organisms present in Pre- Cambrian rocks. The existence of insoluble kerogen is used as proof of biogenicity. Similarly, the occurrence of pristane and phytane, degradable products of chlorophyll molecule, may be used as proof of photosynthesis.

2. Trace Fossils or Ichnofossils:

Some­times, indications of prior existence of organisms in the sediments of earth may be regarded as trace fossils or Ichnofossils. These include animal tracks or foot print preserved in rocks, burrows of invertebrates, coprolites (fossil excretes), gastroliths (polished stones in the abdomen of dinosaurs), gnawed bones, etc.

3. Microfossils:

Microscopic organisms like bacteria, spores and pollen grains, fungal and algal spores, foraminifera, diatoms, epider­mal and wood fragments of plants etc. preserved in the sedimentary deposits are referred to as microfossils. Microfossils are visible only after maceration of sediments.

4. Megafossils:

Large parts of plants like leaf, stem, root, flower, seed, etc. and animal remains as whole organism or in parts, preserved in the sedimentary deposits are called megafos­sils. These are visible to naked eyes and are the better source of morphological as well as anatomical studies.

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