What process allowed for earth's atmosphere to become high in Oxygen?

The older layers/fossils are found deeper in the ground - the newer layers are towards the top

biological change in living things (species) over time and generations

a group of organisms that can reproduce and produce fertile offspring

Mechanism/process by which the environment causes certain variations/traits in a species to be more advantageous - this allows the organisms that display those traits to survive longer and reproduce more

The mechanism/process by which humans select specific traits in other organisms and then breed for those traits/variations

Evolution scientist who developed a classification system to group organisms based on their similarities

inherited traits that are selected for over time because they allow the organisms to best survive in their environment

2 species, without a recent common ancestor, that are becoming more alike based on evolving and adapting to similar environments (dolphins and sharks)

2 species, with a recent common ancestor, becoming less alike over generations resulting from adapting to different environmental conditions

process by which 2 species that evolve together

What are the 5 evidences of evolution

similar structures that have different functions describes what type of structures

different structures that have similar functions describes what type of structure

a structure with no known function, buy may have had a function at one time