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Helen [10]
3 years ago
13

How do scientists know that humans originated in Africa?

Biology
1 answer:
exis [7]3 years ago
4 0
The oldest bones of human decent were found in Africa
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Which compents make up the cardiovascular
satela [25.4K]

The components that make up the cardiovascular system are....

The Heart.

The Arteries.

The Veins.

The Capillaries.


<em>Hope this helps</em>

8 0
2 years ago
If a cell becomes arrested within the cell cycle because it is unable to replicate its dna, which of the stages would you predic
andreev551 [17]
That would be the gap 1 phase/
8 0
3 years ago
The cell theory eventually replaced the concept of spontaneous generation as a result of what experimental evidence?
Arisa [49]

<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.  

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3 years ago
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Common parts
nucleus
endoplasmic reticulum
mitochondria
ribosomes
golgi apparatus
plasma membrane or cell membrane
vesicles

7 0
3 years ago
Why is it important to define the limits of an ecosystem and what are some examples of those limits?
n200080 [17]
Ecosystems can only have so many organisms living in it before the vegetation’s can’t break it all down.
5 0
3 years ago
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