Origin and Evolution of Life and Introduction to Classification

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Organic evolution refers to the gradual development of more complex organisms from simpler forms over millions of years through changes in heritable characteristics. It explains how life diversified f…

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A species is a group of individuals that are similar in structure and function, can interbreed freely, and produce fertile offspring. For example, all modern humans belong to the species Homo sapiens.

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The Chemosynthetic Theory, proposed by A.I. Oparin, suggests that life originated from non-living matter through a series of chemical reactions in the early Earth's oceans. Simple organic molecules li…

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The early atmosphere of Earth contained methane (CH₄), ammonia (NH₃), hydrogen (H₂), and water vapor (H₂O). There was no free oxygen at that time. This reducing atmosphere supported the formation of o…

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The Miller-Urey experiment simulated early Earth conditions by passing electric sparks through a mixture of methane, ammonia, hydrogen, and water vapor. After a week, they found organic compounds like…

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1. Formation of simple organic molecules (like amino acids) from inorganic gases using energy sources like lightning. 2. Joining of simple molecules into larger ones like proteins and sugars. 3. Aggre…

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Coacervates are microscopic, spherical aggregates of organic molecules that form spontaneously in aqueous solutions. They have a distinct boundary and can perform simple metabolic reactions. In the or…

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Homologous organs are structures that have the same basic origin and internal anatomy but may perform different functions. They indicate common ancestry. For example, the forelimbs of humans, bats, wh…