Vocabulary
The death of every member of a species.
What is extinction?
The extinction of the dinosaurs.
What event started the Cenozoic era?
The marine reptile most closely resembling a dolphin.
Ichthyosaur
550 million years ago this big change in type of organisms appeared in the ocean.
multicellular life
Organisms without cell nucleus that appeared 3.6 billion years ago.
What are prokaryotes?
A way to determine a fossil's exact age by analyzing the atoms within the fossil sample.
What is relative dating?
This large marine species disappeared 2 million years ago during the Cenozoic era.
What are megalodons?
The mesozoic era lasted from roughly when to when?
250-66mya
What was the Cambrain explosion?
Great increase of biodiversity due to increased oxygen levels in the ocean.
The name given to the first prokaryotes, which got their energy from chemicals in deep sea vents
chemoautotrophs
The type of symmetry that fish have
What is Bilateral symmetry?
The current apex predators of the oceans, which replaced the marine reptiles. (2)
Whales and sharks
Where did the dominant reptiles of the mesozoic oceans first evolve from?
Land reptiles
Sponges and cnidarians exhibit ________ symmetry.
Radial
Cells that developed organelles 2 billion years ago.
What are Eukaryotes?
This was the age of reptiles.
What is the Mesozoic era?
The Age of Mammals.
The Cenozoic era is known as the Age of what?
What event began the Mesozoic era and when was this event?
The permian mass extinction 250mya
360 million years ago this organism that lived in water and crawled on land appeared.
What is Tiktaalik?
Ozone (O3), which protects life from UV rays, only was formed once regular atmospheric oxygen (O2) was present. What organisms do we have to thank for this?
photosynthetic bacteria
The age that humans evolved in.
What is the Cenozoic era.
The two main classifications of whales, and which came first?
Toothed and baleen; toothed
Name the three biggest competitors in the oceans during the mesozoic era.
What is a protist?
Unicellular Eukaryote - can be plant or animal
What event allowed for multicellular life to appear in the oceans?
The great oxygenation event!
What is a tetrapod?
An animal that walks on four legs - Tiktaalik was one of the first tetrapods
What two traits do all mammals have, including marine mammals?
Hair and production of milk!
How could one distinguish between Plesiosaurs and Mosasaurs?
Plesiosaurs usually have longer necks and powered swimming with their flippers, while Mosasaurs powered swimming with their tails.
What groups of organisms were the apex predators of the paleozoic era?
fish and arthropods
The experiment that proved the capability of organic molecules to form during the early formation of the earth was called the....
Miller Urey experiment