optical / light microscope

Optical microscope was invented in 17th century - the oldest microscope. can be often referred to as light microscope. It makes tiny details visible. 

Optical Microscope Parts Named

How to use light or optical microscope

Biology. How Scientists work.

#maggots

#redi's experiment 1668  #spontaneous generation - "life arises from nonliving matters"

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HYPOTHESIS

Reid's Hypothesis: Redi's wanted to know how come maggots appear  on meat after flies were around? easy :   they just laid such tiny eggs so people are not able to see them.

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                                                                              TEST

                                                Now we need to test this hypothesis BY AN EXPERIMENT:

             WE CAN ONLY CHANGE ONE THING (VARIABLE) DURING AN EXPERIMENT.

VARIABLE - THING THAT WE CAN CHANGE DURING AN EXPERIMENT. 

CONTROLED EXPERIMENT - in this experiment we can only change one thing (variable) at a time.

MANIPULATED VARIABLE - thing that is changed on purpose.

(covers)

RESPONDING VARIABLE - thing that changes as a result of changes in the manipulated variable.

(maggots appear, maggots doesn't not appear)

CONTROLED VARIABLE - NEVER CHANGES 

(meat, jars, location, T, time)

the idea of Spontaneous generation was refuted as a result of Redi's experiment. 

ALL LIVING THINGS COME FROM

 OTHER LIVING THINGS

if a hypothesis becomes very well supported , we can now consider a theory.

theory is very well tested explanation.