| A | B |
|---|
| Abiogenesis or Spontaneous Generation | Living things come from nonliving material. |
| Biogenesis | Living things come only from pre-existing living things. |
| Francesco Redi | Proved that maggots come from the eggs laid by flies on meat. |
| Lazzaro Spallanzani | Tried to disprove spontaneous generation by boiling broth in two flasks, covering one and leaving the other open. |
| Louis Pasteur | Successfully disproved spontaneous generation by boiling broth in flasks with long, curved necks. |
| Maggots | Larvae of flies. |
| Manipulated variable | The one factor that a scientist changes in an experiment. |
| Controlled experiment | An experiment in which all factors are identical except one. |
| What was the manipulated variable in Redi's experiment? | Jar cover |
| What was the control setup in Redi's experiment? | The open jar of meat |
| Controlled variables | The conditions in an experiment that are kept the same. |
| Experimental setup | The part of an experiment that has the manipulated variable. |
| Control setup | The part of the experiment that does not have the manipulated variable. |
| Why is a control setup necessary in an experiment? | It serves as a standard for comparison. |
| What were the manipulated variables in Spallanzani's experiment? | Stopper and air. |
| What was the manipulated variable in Pasteur's experiment? | The boiling of the broth |
| What was the experimental setup in Redi's experiment? | The covered jar of meat |
| What was the experimental setup in Spallanzani's experiment? | The sealed flask of broth |
| What was the experimental setup in Pasteur's experiment? | The boiled flask of broth. |
| What was the control setup in Spallanzani's experiment? | The open flask of broth |
| What was the control setup in Pastuer's experiment? | The unboiled flask of broth |
| Why wasn't Spallanzani's conclusion accepted by other scientists? | He had two manipulated variables. |
| directly or indirectly, living things us | Energy |
