1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Law Incorporation [45]
3 years ago
14

To disprove spontaneous generation, pasteur used swan-necked flasks to allow entry of air to the boiled broth while blocking con

taminating dust. this was his treatment flask. what do you suppose he used for a control?

Biology
1 answer:
Andru [333]3 years ago
3 0

Pasteur produced a nutrient broth and placed equal amounts of it in two long necked flasks. One flask had a straight neck (control) and the other had a swan shaped bent neck (being tested). He boiled the broth in both the flasks to kill any living organism that might be surviving on it. The two flasks were then left in the open air of the room to cool down. After several days passed, Pasteur noticed that the broth in the straight necked flask had changed its color but the swan necked flask didn't. From this observation he was able to conclude that the straight necked flask had let the organisms enter the flask and contaminate the broth. The swan necked flask blocked the entry of the organisms from the open air and thus remained unaffected.

You might be interested in
Which of the following conclusions can be made based on the observed fact that stem cells can differentiate into any kind of cel
Hatshy [7]

Answer:

a

Explanation:

7 0
3 years ago
Many plants contain minerals. true false
serg [7]
The answer is true, plants often have minerals as in elements like iron.
7 0
3 years ago
A student conducts an experiment where a thin piece of material is placed into a beaker to separate it into two halves. The stud
Phoenix [80]

Answer:

b

Explanation:

7 0
3 years ago
A seed was discovered and, when planted, grew to be a large flowering plant. ​
Crazy boy [7]

Answer:

The answer is Eukarya.

Explanation:

4 0
3 years ago
Leopold's genotype is xY. what does this mean?
dalvyx [7]
The answer would be A. Because hemophilia is recessive and the Leopold carries the recessive trait
4 0
3 years ago
Read 2 more answers
Other questions:
  • A new object, Object X, was discovered outside our solar system. Object X is small and rocky, is not a satellite of any other ob
    6·2 answers
  • What is parasympathetic nervous system
    12·1 answer
  • No wrong answers.
    7·1 answer
  • skelettal remains are found and authorities have no clue who it might be. What would a pathologist be able to tell the authoriti
    5·1 answer
  • Plz I need help with this!!
    8·1 answer
  • What kingdom does this mostly belong to
    15·1 answer
  • What organelle releases this stored energy in animal cells? (SC.912.L.14.3)
    14·1 answer
  • Which of the following describes stylistic techniques?(1 point)
    10·1 answer
  • Ments
    5·1 answer
  • Soon after blood is filtered through the nephrons, is released from the body.
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!