Cells Is fire a living thing Robert Hooke
Cells
Is fire a living thing?
Robert Hooke • Observed cork under a microscope • Called the little boxes cells
Anton van Leeuwenhoek • Examined blood, rain water, teeth scrapings • Found tiny animal-like things • Led to better microscopes
Other Scientists • The discoveries of Hooke and van Leeuwenhoek led to better tools and other discoveries about cells. M. Schleiden (Botanist) T. Schwann (Zoologist) R. Virchow (Pathologist)
Cell Theory • All living thing are made of cells • Cells carry out the functions needed to support life • Cells come from other living cells Scientific Theory – widely accepted explanation of things in nature. It must be supported by evidence.
Louis Pasteur • Noticed milk that soured contained many bacteria • He invented a process that killed the bacteria and allowed the milk to last longer • He wondered if bacteria were responsible for the illnesses in people and animals.
Louis Pasteur • He noticed by studying air, water and soil that bacteria were everywhere (germs) • He realized that by understanding germs we could prevent disease • His work led to vaccines
Spontaneous Generation • Life could come from nonliving things • Pasteur showed in a series of experiments that spontaneous generation can not occur • He supported cell theory
Redi’s Experiment • Shows that the presence of maggots was not spontaneous but a result of fly offspring
Pasteur’s Experiment • Showed that bacteria was in the air and did not spontaneously generate.
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