Origins of Life & Paleobiology Flashcards

These gases created a reducing atmosphere, crucial for the chemical reactions leading to the origin of life.

The primordial soup hypothesis proposes that life began in a warm pond with the presence of amino acids and other organic compounds.

Stanley Miller and Harold Urey simulated early Earth conditions, demonstrating amino acids could form from simple chemicals with electrical sparks.

The panspermia hypothesis suggests that life, or the precursors of life, came to Earth from space, potentially via meteorites.

The RNA world hypothesis suggests RNA could store genetic information and catalyze chemical reactions before DNA and proteins evolved.

Protobionts are aggregates of abiotically produced molecules surrounded by a membrane, showing some properties of life such as simple reproduction and metabolism.

These energy sources could have powered the synthesis of organic molecules necessary for the emergence of life.

Micelles are spherical aggregates of lipid molecules that can form under prebiotic conditions, potentially playing a role in the development of cellular life.

Fossils can include bones, shells, imprints, or even traces like footprints, and they provide valuable information about ancient life.

Each of these events led to significant loss of biodiversity and reshaped the evolutionary path of life on Earth.

This extinction is believed to have been caused by a massive asteroid impact, leading to drastic environmental changes.

Fossils help scientists understand the diversity of past life forms, their structures, and how they are related to present-day organisms.

Soft-bodied organisms are less likely to fossilize, and many environments do not promote fossilization, leading to gaps in the record.

Relative dating uses the position of fossils in layers of rock, while absolute dating often involves radiometric techniques to determine age.

Paleontologists examine fossils to reconstruct ancient ecosystems and understand evolutionary history.