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 T. Schwann R. Virchow (Botanist) (Zoologist) (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.