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18 Cards in this Set

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a member of the chordate class Amphibia, which includes the frogs, toads, and salamanders, as well as the limbless caecelians
Amphibian
a member of the animal phylum Arthropoda, which includes the insects, spiders, ticks, mites, scorpions, crustaceans, millipedes, and centipedes
Arthropods
a member of a class of tracheophytes (Coniferophyta) that reproduces by means of seeds formed inside cones and that retains its leaves throughout the year
Conifer
the hypothesis that certain organelles, especially chloroplasts and mitochondria, arose as mutually beneficial associations between the ancestors of eukaryotic cells and captured bacteria that lived within the cytoplasm of the pre-eukaryotic cell
Endosymbiont Hypothesis
an organism whose cells are eukaryotic; plants, animals, fungi, and protists are eukaryotes
Eukaryote
a rigid external skeleton that supports the body, protects the internal organs, and has flexible joints that allow for movement
Exoskeleton
a human or a prehistoric relative of humans, beginning with the Australopithecines, whose fossils date back at least 4.4 million years
Homonid
a member of the fish order Sarcopterygii, which includes coelacanths and lungfishes. Ancestors of today's lobefins gave rise to the first amphibians, and thus ultimately to all tetrapod vertebrates
Lobefin
a member of the chordate class Mammalia, which includes vertebrates with hair and mammary glands
Mammal
the extinction of a large number of species in a short period of time
Mass Extinction
a small, hollow sphere formed from proteins or proteins complexed with other compounds
Microsphere
the theory that Earth's crust is divided into irregular plates that are converging, diverging, or slipping by one another; these motions cause continental drift, the movement of continents over Earth's surface
Plate Tectonics
a mammal characterized by the presence of an opposable thumb, forward-facing eyes, and a well-developed cerebral cortex; includes lemurs, monkeys, apes, and humans
Primates
an organism whose cells are prokaryotic; bacteria and archaea are prokaryotes
Prokaryotes
the hypothetical evolutionary precursor of living cells, consisting of a mixture of organic molecules within a membrane
Protocell
a member of the chordate group that includes the snakes, lizards, turtles, alligators, and crocodiles; not a monophyletic group
Reptiles
an RNA molecule that can catalyze certain chemical reactions, especially those involved in the synthesis and processing of RNA itself
Ribozyme
the proposal that living organisms can arise from nonliving matter
Spontaneous Generation