A. Origin of Life- Scientists Hypotheses Disproving Spontaneous Generation (Word Bank: air, sealed, open, bacteria, gauze, spont
aneously) Through the early 1800s, people believed organisms could ________________ develop, an idea known as spontaneous generation. In 1668, many believed maggots were spontaneous generated from rotting meat. Francis Redi’s experiment disproved this by experimenting with meat in open_jars, tightly snealed_jars and jars covered with cloth netting. It was also believed that bacteria spontaneously generated in broth. Lazzaro Spallanzani removed the _________ from a flask, __________ the broth and sealed the flask. No bacteria generated without exposure to the air. Some people still supported spontaneous generation but thought that air was a ________ force, necessary for it to occur. In 1859, Louis Pasteur completely disproved spontaneous generation by using a special flask that allow ______________ in but captured bacteria before it could get to the broth. No _________________ grew in the flask after boiling = no spontaneous generation. 2. First Life (Word Bank: eukaryotes, prokaryotic, variety, self-replicating, organic, photosynthesis, oxygen) Earth’s atmosphere had to be very hot and with little oxygen for the first ________________ molecules to first form. Organic molecules clumped together for form ______________________ structures that later evolved into cells. __________________________ cells were the first to evolve. When cells gained the ability to do ___________________________, they used up carbon dioxide and put more __________________ into the atmosphere.
Melanosis is any condition of unusual deposits of black pigment in body tissues or organs. Therefore, your correct answer would be letter choice A provided.
