Much of the driving force behind man is
to understand and define how and why they exist. Many have tried to
answer this question, ranging from the spiritual to the literal in
reason, often trying to find a compromise between the two schools of
thought. The spiritual quest began with the Zoronastrians of the
Persians, monotheistic worshipers who questioned why they existed
were the precursors for Judeo-Christian religions that would shape
the field of science. The religious perspective thought the world
was fresh and would end soon. There were varying views on the
natural order of humans, flora, and fauna.
The Greeks believed the world was old
and unending. They followed a philosophy developed by Plato called
essentialism, believing that each species had specific traits which
all members of that species would share and define them. In
contrast, Aristotle believed that traits could overlap between
species, not making them the same but showing a close relation
between the two. He arranged organisms from most primitive to most
advanced, based on how much they deviated from what they viewed as
the divine ideal. This process, called the Great Chain of Being,
expressed how all organisms were connected and was the framework for
modern biological taxonomy, or classification.
Carolus Linnaeus was a Swedish
botanist who expanded taxonomy from his predecessors, he viewed his
work as a documentation of the order of life as created by God. This
system did not account for changes or evolutions amongst species
members for during this time in Europe, the mid 1700s, as the
traditional view followed essentialist requirements for species
classification and that no new species could exist as all species
were created by God all at once.
In the early 1800s catastrophism was a
theory to understand the abrupt disappearance and emergence of
different species via natural disasters such as floods, earthquakes,
or acts of God. This theory conformed to the traditional view, but
caused issue by suggesting new species could be created. The same
theorist, Cuvier, also suggested that not all organisms were in a
succession of hierarchy, but actually in four separate groups with
each group being unconnected to the other. These theories eventually
lead to uniformtarianism, which allowed for change but argued that
change was part of God's plan.
Inconsistencies continued to rise
leading into the 1900s, many scientists including George Louis
Leclerc, Charles Darwin's grandfather Erasmus Darwin, and
Jean-Baptiste Lamarck tried to link together the information
eventually leading to transformational evolution. The basics of
transformational evolution was an organism's ability to adapt to a
changing environment. The key was an individual's ability to change
instead of an entire species becoming something new. Lamarck
hypothesised that an organ becomes stronger with use and weakens by
disuse, and that this trait would be inherited by offspring. This
would eventually be debunked, but opened the door for Charles
Darwin's theory of evolution.