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'D' in Science
counteracting forces that stabilizes systems
evidence of a meteor impact;high concentrations of an element that is rare on earth but common in meteorites
first reptiles to invade the marine realm w/ paddle like limbs (modern seal)
recreated early environments through the use of amino acids incorporated into proteins
Earth's Absolute Age
sea spreads landward
natural balance; the root is as big as the mountain
when/ where did Homo Sapiens evolve?
first hominid species to to migrate past Africa
similar biological forms evolve in groups that belong to different branches of the tree of life
spreading of trees -> increase O2
Formation of the moon
what period did the trilobites suffer their last extinction
the physical and chemical principles operating today have operated the same throughout history
the oldest strata lie at the bottom and higher strata are excessively younger
'the present is the key to the past'
increasing wavelengths as light travels through space- supports big bang theory
tiny spherical floating forms who make up deep sea sediment
structure allowing respiration
fragmentation of Pangea
seaward migration of shoreline
last glacial maximim?
large portions of continent that have undergone no substantial tectonic deformation
resembling mammals; legs vertical beneath the body with complex and powerful jaws
mountain building from compression of continental crust and additional igneous material
burial of trees -> decrease O2
large rocks far from their parent bed rock that are too large to have been transported by any means other than continental glaciers
Select extinction of small tooth herbivores can be attributed to...
composition of early ocean
when depositional environments migrate laterally; sediments fo one enviornment lie on top of those from the adjacent one
marine fauna; invertebrate swimmers
emergence of earliest homminids
Age of Mammal
oldest Eukaryote fossil- 2.1 Ga
age of the moon
each atom with a unique atomic weight
What were the secrets to the success of Angiosperms?
fish-like vertebrates with fossilized teeth
3 glacial centers
sedimentary process that removes CO2 from the atmosphere
formation of Pangea
arthropods with heavily calcified, segmented bodies
largest Precambrian shield
bony fishes characterized by symmetrical trails, specialized fins, and short jaws
start of the modern Ice Age
oldest boens applied to the Homo genus?
animal intermediate in from between Humans and Apes
first skeletal fossil- Neoproterozoic
an organism whose cells are characterized by a nucleus and other complex structures
Humans are the only living descendent of (blank)
3 domains of life
What animal evolved from a carnivorous land to a large marine predator during the Eocene?
How did Primates migrate to North America?
when did humans invent agriculture?
destroys systems through one directional force
carried tropical warm waters from the Pacific through the Mediterranean/Gulf of Mexico and back
formation of early atmosphere
all strata are horizontal when they form
the intrusive igneous is always younger than its surrounding rock
similar rocks on opposite sides of the valley seem to have been connected
Age of Dinosaurs
large armored-head, jawed fish who fed on smaller fishes
most abundant rock of our surface
produced fossils in the from of cysts
two groups of mammals
Swimmer; pursued prey by jet propulsion
'fish lizard'- top predator, marine mammal
earliest example of modern plate tectonics
Dates of Creatceous mass extinction
blunt tooth shell crushers (enormous turtles)
an abrupt shift back to full glacial conditions; 13,000 years ago
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