How Did Life Begin?
The first living things on Earth came from non living material. The first life forms must have arisen spontaneously once the first chemicals of life, organic molecules, were made. Organic compounds include carbohydrates, lipids, proteins, and nucleic acids, which are the building blocks of DNA helped start life.
Where Did Life Begin?
Deep-sea hydrothermal vents were the prefect environment that might have supplied the energy and chemical raw materials for the origin of life.
Origin of Small Organic Molecules
The first organic molecules formed about 4 billion years ago. This may have happened when lightning sparked chemical reactions in Earth's early atmosphere, which formed RNA which may have been the first organic molecule on earth.
Evolution of Sexual Reproduction and
Multicellular Life
Sexual reproduction first appeared by 1.2 billion years ago in the Proterozoic Eon. All sexually reproducing eukaryotic organisms likely derive from a single celled common ancestor.
Descent with Modification
Descent with modification is when a traits go from parent to offspring, and this concept is one of the fundamental ideas behind Charles Darwin's theory of evolution
Natural Selection: The Mechanism of Evolution
Natural selection is when an organism with heritable traits that include survival and reproduction will tend to leave more offspring than others.
The Fossil Record
The Fossil Records show us that the younger the rock that the fossil was laying on if younger the fossil was, so when you take old fossils and compare them to the new fossils you can see the evolution that occurred.
Geographic Distribution
The differences and similarities between organisms in other parts of the world were the first sight of evolution.
Comparative Anatomy
Certain similarities in structure among species provide clues to evolutionary history.
Comparative Development
Other clues to evolutionary history come from comparing the
development of various organisms
Molecular Biology
This is the most resent way to study the evidence of evolution. In this the DNA in checked between species to check for evolution.
Co-evolution
Co-evolution is when one species evolves in response to the evolutionary changes in another species.
The Evolution of Complex Features
when people think of complex features, they think a new lim, or a new shape but complex features can be something small to like better eye sight.
Adaptation of Existing Structures to
New Functions
Is when something evolves as adaptations for certain functions that later fulfilled different functions.