Environmental Changes Tes

What are 2 Mass Extinctions?

Permian Mass Extinction and Cretaceous Mass Extinction

What are the types of radiometric dating?

Uranium/Lead dating, Potassium/argon dating, and Rubidium/Strontium dating

Most common type of Radiometric dating?

Uranium/Argon

What type of Radiometric dating is used for the oldest rocks?

Rubidium/Strontium

A cow is best fit closest to a?

Wolf

What is Half-Life?

• Is the amount of time it takes for half of a radioactive substance to decay into a non radioactive substance

What are some problems with Radiometric dating?

• Radiometric dating costs a lot of money, and the tools are hard to find

• It is very time consuming

What are 3 assumptions that makes Radiometric dating reliable?

1. Rate of decay is constant

2. When formed the rock had all of substance 1 and none of substance 2

3. Neither of the elements escaped the rock

What are other methods of dating?

Racemization- measures amino acids

Fission Tracks - A technique used to  tell the age of a uranium sample microscopically. Looks for rings

Mutation-Selection theory/Gradualism

That there are mistakes happening all the time, and environmental changes all the time,

What are Index Fossils??

• Ones that are so common that the scientific community has said they know what these fossils are and how old they are

What are some examples of Index Fossils?

• Trilobites

• Ammonites

• Graptolites

• Orthoceras

Who made the Punctuated Equilibrium?

Made by Gould and Eldridge

Our sun has a sister star is called?

Nemesis

What is the Link from fish to amphibian?

Tiktaalik

What is the Link from amphibian to Reptile?

Acanthostega

What is the Link from Reptile to Mammal

Thrinaxodon

What is the Link from Reptile to Bird? And is considered the most important missing link

Archaeopteryx

What is the Link from Land animals to Aquatic animals?

Ambulocetus

Australopithecus africanus

• most important, this is LUCY, pelvis indicates she is an upright walker

A. Robustus

•  is considered an ancestor of Africanus just a different line than humans

•  Males 1.5x size of females

• @ 400 cc Brain capacity

Ardipithecus ramidus

• Oldest pre-human

Homo habilis

Lots of skulls have been found. Referred to as Handyman

Homo ergaster

 Turkana boy

Homo erectus

 Femur indistinguishable from modern man

fully up-right walker

Piltdown Man

Was discovered in England. Missing link. Was a lie. Someone took ape jaw and human skull and put them together

Java Man

Found femur top of skull but turned out to just be homo erectus

Gigantopithecus

 It was “big foot”. Found jaws that were really big and skulls that were really big. That were up-right walkers. myth

Homo sapiens sapiens

originally Cro-Magnon Man - Modern Man