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Biology: Life On Earth Ch. 17
Vocab for Ch. 17: The History of Life
18
Biology
Not Applicable
11/21/2005

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Term
amphibian
Definition
Animals which could survive in water and on land.
Term
arthropods
Definition
The first animals to move onto land because of thier exoskeleton.
Term
conifer
Definition
Seed-bearing plants which portected their developing seeds inside cones.
Term
endosymbiont hypthesis
Definition
A hypothesis which proposes that primitive cells acquired the precurors of mitochondria and chloroplastas by engulfing certain types of bacteria.
Term
eukaryotes
Definition
Cells with a nucleus and organelles.
Term
exoskeleton
Definition
A hard covering surrounding the body.
Term
hominid
Definition
Humans and their fossil relatives
Term
lobefins
Definition
A group of fishes that important features that owuld allow descendants to colonize land: fleshy fins and an outpuching of the digestive tract (lungs)
Term
mammals
Definition
Animals with the abilidy to feed their young with secretions of the mammary glands.
Term
mass extinction
Definition
An episode which results in the extinction of many species.
Term
microspheres
Definition
Hollow structures which resemble living cells.
Term
plate tectonics
Definition
The movement in which solid plates of Earth's surface move above a fluid layer.
Term
primate
Definition
A mammal group which includes humans, lemurs, monkeys, and apes.
Term
prokaryote
Definition
The first cells to arise which had no nucleus and obtained nutrients and energy by absorbing organic molecules from their environment.
Term
protocell
Definition
The result of a microsphere surrounding the right ribozymes creating something resembling a cell.
Term
reptile
Definition
The animals succeeding amphibians which had waterproof eggs, waterproof skin, and improved lungs.
Term
ribozyme
Definition
an RNA molecule which can also perform the functions of a protein enzyme.
Term
spontaneous generation
Definition
The idea that living things appeared from nonliving matter and from other unrelated forms of life.
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