These are all straight out of the Science book. There are no spaces between double word answers.
COMPLETE!
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Horizontales
The period where the climate cooled causing a series of ice ages.
Period in which dinosaurs became common on land.
Animal with a vertebrate that can control its body temperature and feeds milk to its young.
Animals with jointed legs and many body segments.
The period where birds began to replaces flying reptiles.
Geologic time begins with this long span of time.
Resembled modern clams, but are only distantly related to them.
The ocean absorbed much of this from the atmosphere
Record of the geologic events and the evolution of life forms as shown in the fossil record.
Reptiles developed during this period.
A process where organisms begin using energy from the sun to make food
Eras are subdivided into units of geologic time called _________
Animal with scaly skin and lay eggs that have a tough, leathery shells.
The first found fossils of ___________ organisms were 3.5 billion years old
The period that is often called the Age of Reptiles
Ball of dust, gas, and ice that orbits the sun.
Both invertebrates and vertebrates lived in the _________ seas.
Verticales
There are three of these between Precambrian Time and the present
Type of dating used to find the age of moon rocks.
Many types of living things became extinct at the same time.
Animals without backbone
Animal with a backbone
The beginning of the Paleozoic Era where a great number of different kinds of organisms evolved.
Huge and varied group of arthropods.
Scientist that studies fossils
Some oxygen that was released into the atmosphere turned into ______.
The sun's release of strong bursts of particles
Animal that lives part of its life on land and part of its life in water.
Great landmass, or supercontinent
A part of Earth's first atmosphere
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