<u>Answer:-</u> <em>Option C </em>- evidence that microorganisms cannot grow in boiled broth when new organisms were not allowed to enter.
<u>Explanation:-</u>
- <em>Theory of spontaneous generation</em> stated that the living organisms can be created from non living matter. However, this theory was disapproved and replaced by the <em>cell theory</em> which stated that all living organisms are created from cells and new cells arise from pre-existing cells.
- There were several experiments conducted by various scientists to disapprove the theory of spontaneous generation however, the experiment that was most successful to do so was the one conducted by <em>Louis Pasteur</em> in 1859.
- <em><u>Description of the experiment:-</u></em>
-In his experiment, Pasteur boiled a meat broth in a flask (it was known that boiling the broth kills the micro organisms) and then heated the neck of the flask to bend into a S- shape.
The purpose of the S shaped neck was to allow the air to enter into the flask but not the micro-organisms as the micro organisms will settle by gravity in the neck and not reach into the flask.
<em>observations of the experiment</em> :-
1. Pasteur observed that even though the air entered the flask no micro organisms were growing in the flask.
2. Further,when he tilted the flask so that the broth came in contact with the part of the neck where the air borne microorganisms could have settled he was able to observe microbial growth in the flask.
These observations laid the theory of spontaneous generation to rest and proved that <em>organisms can only grow in the presence of pre-existing cells </em>which in this case were the microorganisms.
Answer:
Explanation:
Electricity is sent through high-intensity discharge lamps. A high-intensity discharge lamp emits light by an arc of electricity created between two electrodes.The electrical arc generates heat, which works with the gas and metal to create light-emitting plasma. Streetlights use bypass technology.
Coronary arteries are the arteries that branch off the ascending aorta to supply the heart with oxygenated blood. The heart muscle which similar to each further organ or tissue in your body is essential of oxygen-rich blood to stay alive. Blood is delivered to the heart by its own vascular system which is called coronary circulation. The aorta the main blood supplier to the body branches off into two core coronary blood vessels also named arteries. The right coronary artery deliveries blood primarily to the right side of the heart. The right side of the heart is minor because it drives blood only to the lungs and the left coronary artery which outlets into the left anterior down artery and the circumflex artery deliveries blood to the left side of the heart. The left side of the heart is bigger and more well-developed since it drives blood to the rest of the body.
Number 4 ok that is answer
Explanation:
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