🦴 Fossils
These are preserved remains or traces of organisms from long ago.
What are fossils?
The oldest fossils are found in these layers.
What are the bottom layers?
This is the change in organisms over long periods of time.
What is evolution?
This is a baby organism growing inside an egg or body.
What is an embryo?
When organisms share many traits, they are this.
What are closely related organisms?
Fossils give scientists information about these two things: past life and this
What are environments (or habitats)?
The youngest fossils are found in these layers.
What are the top layers?
These include fossils, embryos, and body structures that support evolution.
What are types of evidence of evolution?
Scientists compare embryos to look for these things in early development.
What are similarities?
Scientists study rock layers to understand this about Earth.
What is Earth’s history?
Fossils found in deeper rock layers are this compared to fossils above them.
What are older fossils?
This scientific rule states that deeper rock layers are older than layers above.
What is the Law of Superposition?
This process explains how organisms with helpful traits survive and reproduce.
What is natural selection?
If embryos look similar, scientists say the organisms share this.
What are common ancestor?
Whale evolution is evidence that organisms do this over time.
What is change (or evolve)?
This type of rock is where fossils are most commonly found.
What is sedimentary rock?
This is the process where sediments build up and harden to form rock layers.
What is sedimentation (or layering of sediments)?
Evolution is this type of scientific idea because it is supported by evidence.
What is a scientific theory?
These are body parts that look the same but are used for different things.
What are homologous structures?
This is NOT considered evidence of evolution.
What is where organisms live?
If a fish fossil is found in a desert, this must have once covered the area.
What is water (or an ocean/sea)?
By comparing fossils in different layers, scientists determine this.
What is the relative age of organisms?
When organisms share a common ancestor, they are this.
What are related organisms?
A whale flipper and a human arm are examples of these because they have the same bones.
What are homologous structures?
These include fossils, embryos, homologous structures, and rock layers.
What are types of evidence of evolution?