Vocab 1
To develop and change genetically over time is...
What is Evollution
A record of species that lived long ago
What is fossil record
I am an anatomical feature or behavior that no longer has a purpose.
What is a Vestigial Structure?
The principle that layers of sediment, such as those that form rocks, are originally deposited flat
Law of Horizontality
The study of similarities and differences in the body structures of different species to understand their evolutionary relationships.
Comparative Anatomy
Body parts that have lost their original function through evolution, like the human appendix.
Vestigial Structures
Structures that are nearly useless in some animals while they are useful in others
What is vestigial structures
I have bone structures that differ from other species but share the same function. For example a bat and a butterfly.
What is an Analogous Structure?
Body parts in different species that are similar in structure because they evolved from a common ancestor, even if they serve different functions (like a human arm and a whale
Homologous Structures
An organism from which others have evolved. A common ancestor is a species that different species have in common in their family tree.
Ancestor / Common Ancestor:
A method used to determine the age of rocks or fossils by comparing their positions in layers of sediment, not giving an exact age but rather older or younger in relation to other layers
Relative Dating
when species are found on different content with similar body structures
What are homologus structures
I share the same/similar bone structure as other species but we all have a different function.
What is a Homologous Structure?
The remains or impressions of ancient organisms preserved in rocks.
Fossils
Body parts in different species that look similar and serve the same function, but evolved separately. For example, wings in birds and butterflies.
Analogous Structures
A rule stating that in a sequence of rock layers, the oldest layer is at the bottom and the youngest is at the top.
Law of Superposition
Structures that share the same function, but are structurally different (hint: bird wing vs mosquito wing)
What is analogous structures
At the very earliest cellular stage across multiple species, we can identify relationships that would not be evident once the embryo is fully formed.
What is Embryology?
A collection of fossils that shows how organisms have changed over time through the ages.
The Fossil Record
A method used to find the exact age of rocks or fossils, usually by measuring radioactive elements.
Absolute Dating
The study of the geologic column provides scientists with important facts.
What is evidence of changes in species over time?
What is the study of species similarities and differences at their early stages of life?
Comparative embryology
Scientists study embryology and anatomical similarities and differences between various organisms.
Evidence of Common Ancestors
The permanent disappearance of a species when all its members die out.
Extinction
Dinosaurs roamed planet Earth for 165 million years until one fatal global event occurred. This event causes a geological clue to this event.
K-T Boundary caused by the impact crater at Chicxulub Mexico