Card Set Information
occurs when minerals carried by water are deposited around a hard structure.
forms when flowing water removes all of
the original tissue, leaving an impression.
what records the activity of an organism
Amber-preserved fossils are organisms that become trapped in tree resin that hardens after the
tree is buried.
Preserved remains form when an entire organism becomes encased in material such as ice.
estimates the time during which an organism lived. It compares the placement
of fossils in layers of rock. Scientists infer the order in which species existed.
atoms of an element that differ in
their number of neutrons.
the amount of time it takes for
half of the isotope to decay.
can provide the relative age of a rock layer.
existed only during specific spans
of time. occurred in large geographic areas
last tens of millions of years.
last several million years.
The most widely accepted hypothesis of Earth’s origins
two organic molecule hypotheses.
different hypotheses of early cell structure.
iron-sulfide bubbles hypothesis
lipid membrane hypothesis
The oldest known fossils
provide evidence of early colonies of life.
a relationship in which one organism lives within the body of another.
an advantage of sexual reproduction
may have led to the evolution of multicellular life.
Multicellular organisms first appeared during the
led to a huge diversity of animal species.
era is known as the Age of Reptiles.
mammals with flexible hands and feet, forward-looking eyes and enlarged brains.
lemurs, lorises, tarsiers
New World Monkeys, Old World Monkey, Hominoids
Hominids, Great Apes, Lesser Apes
the oldest living primates.They are mostly small and nocturnal
means walking on two legs.