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Aneli [31]
3 years ago
5

Describe the source of free oxygen in the Earth’s early atmosphere

Biology
1 answer:
Zina [86]3 years ago
6 0
Tree's give off oxygen for us to breath
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Select the correct answer.
Licemer1 [7]
I don’t know the answer to this question
3 0
2 years ago
DNA, the genetic material of living organisms, is damaged by light in the
insens350 [35]

Answer:

The correct option is <em>B) ultraviolet region, especially below a wavelength of 320 nm.</em>

Explanation:

Ultraviolet light carries an enormous amount of energy in it. It is invisible to the human eye. When UV light with enormous energy and wavelength lesser than 320nm, hits the DNA, it causes changes in the structure of the DNA. Mostly, it affects the thymine nitrogenous base regions and forms pyrimidine dimers. The structure of the DNA changes on all the sites where dimers form and hence, they cannot be properly transcribed.

6 0
3 years ago
3. Consider the technology behind each type of
Degger [83]

Answer:

See the answer below

Explanation:

<em>The light microscope uses visible light to produce images of objects on its slide while the electron microscope uses beams of electrons to project the image of specimens.  Color is a property of photons of light, hence, the light microscope is able to produce images of specimens in their natural colors </em>

<em>The areas of the specimen on an electron microscope in which the beams of electron pass through usually appear white while other areas appear black. Hence, the electron microscopes can only produce grayscale images of specimens unless a false color is added to make the images visually appealing.</em>

<em> </em>

8 0
3 years ago
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The image shows barrels containing toxic waste that were dumped into a body of water.which is the likely effect of the dumping o
TiliK225 [7]

Answer:

The ecosystem will become sick and die.

Explanation:

The toxic waste can travel to other bodies of water, whether it be a river or waterfall. This can contaminate and poison the water, as well as the organisms living inside it. This will harm fish, birds, plants, animals that drink the water, etc.

6 0
4 years ago
Sometimes a new experimental result may seem to go against a well-established scientific theory. Which statement BEST describes
attashe74 [19]

C.) New results should be verified by more experiments before it is accepted

3 0
3 years ago
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