Question

early discoveries in science cer practice
for each short story, identify the claim by highlighting green, find any evidence statements and highlight in yellow. complete the sentence to illustrate how reasoning was used in the scientific discoveries.

1. in 1668, francesco redi wanted to know if meat could spontaneously produce maggots as many people thought at the time. redi believed that the maggots came from flies that lay eggs on the rotting meat. he placed one piece of meat in a jar and covered it with cloth. he left another piece of meat in a jar uncovered. after two weeks, he inspected the meat and found that the one in the covered jar did not have maggots, but the one open to the air did have maggots.

reasoning: if maggots were spontaneously being produced by the meat, then

1. in 1854, a cholera outbreak occurred in london. cholera is a disease that causes intense diarrhea and can be fatal. at the time, many people believed that diseases were caused by \bad air\. john snow had another idea; he thought that cholera was caused by something in the environment where people lived. he went door - to - door and made a map showing households that had cholera. he found that most of the cases were near the broad street water pump. john snow made a case that the water from the pump was making people sick and the pump was shut down.

reasoning: if water was the cause of the sickness, then

1. louis pasteur felt that liquid would spoil because there were particles in the air that could enter the liquid and grow there. he boiled liquid broth and then placed it in a flask that had an s - shaped neck. air could enter the neck of the flask, but any particles would be trapped in the neck. after a week, the liquid was still clear, showing that no growth occurred. pasteur then broke the neck from the flask and let it sit for another week. this time, he saw that the broth had become cloudy and spoiled. louis pasteur’s experiments lead to a process that could keep food fresh for longer, a process called \pasteurization.\

reasoning: if particles in the air could cause food to spoil, then

Explanation:

1. Maggots in open - jar meat would be expected.
2. Cholera cases near pump would stop if water was cause.
3. Unbroken - neck broth would stay clear, broken - neck would spoil.

Answer:

1. Maggots should be in both jars if spontaneously produced by meat.
2. Closing the pump should stop new cholera cases.
3. Liquid with intact neck should stay fresh, broken neck should spoil.