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Systematists, comparative biologists, taxonomists and evolutionary biologists all concern themselves with the evolutionary relationships between animals and plants. Homology is the principle underlying these disciplines. When looking at groups of organisms, similarities between them (homologies) suggest a close common ancestor. For example, human and porcine insulin is very similar in structure (porcine insulin was once used to treat human diabetics). However, there are usually characteristics which would oppose such theories. For example: totally different foetal development, and the...

This rich pictorial history is the first to feature the entire
township of New Scotland. Located west-southwest of
the city of Albany, the township covers a large area in the
center of Albany County. The earliest European settlers arrived
in the mid-1600s and over the next 150 years, they were
followed by immigrants from Holland, Scotland, England, and
other countries.
New Scotland Township contains photographs dating from
1840 to 1980, including dozens of formerly unpublished ones.
Both the photographs and captions contain an amazing amount
of detail...