Ice Age - The most recent glacial period, which occurred during the Pleistocene Epoch and ended about 10,000 years ago. During the Pleistocene Ice Age, great sheets of ice up to two miles thick covered most of Greenland, Canada, and the northern United States as well as northern Europe and Russia.
Ichthyology - The branch of zoology that deals with the study of fish.
Index Fossils - The fossil remains of an organism that lived in a particular geologic age, used to identify or date the rock or rock layer in which it is found. Also called guide fossil.
Indirect Fitness - is the sum of its classical fitness (how many of its own offspring it produces and supports) and the number of equivalents of its own offspring it can add to the population by supporting others.
Intelligent Design Theory - The assertion or belief that physical and biological systems observed in the universe result from purposeful design by an intelligent being rather than from chance or undirected natural processes.
Invertebrates - Any animal lacking a backbone, including all species not classified as vertebrates.
Irreducible complexity - Is an argument by proponents of intelligent design that certain biological systems are too complex to have evolved from simpler, or "less complete" predecessors, through natural selection acting upon a series of advantageous naturally occurring, chance mutations.
Ichthyology - The branch of zoology that deals with the study of fish.
Index Fossils - The fossil remains of an organism that lived in a particular geologic age, used to identify or date the rock or rock layer in which it is found. Also called guide fossil.
Indirect Fitness - is the sum of its classical fitness (how many of its own offspring it produces and supports) and the number of equivalents of its own offspring it can add to the population by supporting others.
Intelligent Design Theory - The assertion or belief that physical and biological systems observed in the universe result from purposeful design by an intelligent being rather than from chance or undirected natural processes.
Invertebrates - Any animal lacking a backbone, including all species not classified as vertebrates.
Irreducible complexity - Is an argument by proponents of intelligent design that certain biological systems are too complex to have evolved from simpler, or "less complete" predecessors, through natural selection acting upon a series of advantageous naturally occurring, chance mutations.