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Citrus2011 [14]
3 years ago
13

The first step in treating drinking water, called ____________________, involves passing water through a series of screens.

Biology
1 answer:
AlekseyPX3 years ago
6 0

The right answer is Filtration.

A water filter is composed of a filtration system that aims to separate the water from the solid particles (residues) by passing it through a porous medium, which allows only the liquids and the finer solid particles to pass through. as the filter holes (porosity). The water that comes out of this filtration system is rid of solid particles larger than the pores of the filter.

Some water filters are designed to make drinking water (very fine filtration, less than the size of a microbe).

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An air pressure of 1,005 millibars is equivalent to approximately how many inches of Mercury?
N76 [4]

1005milibars of pressure corresponds to 29.68inches of mercury.

Option D.

<h3><u>Explanation:</u></h3>

Mercury has a density of around 13.6gm/cc. Thus the pressure of inches of mercury will have a huge effect on the value. As far as bar is concerned, it's around the normal atmospheric pressure measured at sea level. Its around 1,00,000 pascals. So from converting a pressure at millibars to inches of mercury, we need to divide the value by a factor of 33.864.

So, pressure in milibars =1005milibars.

So, pressure in inches of mercury = 1005/33.864 = 29.68 inches of mercury.

6 0
3 years ago
The main difference between the four nucleotides that make up DNA is that they have ?
marissa [1.9K]

The nucleotides in DNA contain four different bases, those of which being nitrogenous bases.

The four bases are:

1 - Thymine

2 - Cytosine

3 - Adenine

4 - Guanine

Hope this helps you. Do mark me as brainliest.

6 0
3 years ago
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Identify the appropriate time period where vascular plants with woody tissues, seeds, and veins shared the land with spiders, sc
dimulka [17.4K]
Answer is Middle Paleozoic era.
Paleozoic era was in 542 Ma - 245 Ma and it has 6 periods as Cambrian, Ordovician, Silurian, Devonian, Carboniferous and Permian.
360-280 Ma - forming of vascular plants with woody tissues, seeds and veins.
430 - 410 Ma - forming of jawed fishes and first amphibians.
420 Ma - forming of scorpions
360 Ma - forming of crustaceans.
3 0
3 years ago
According to the theory of global warming which statement is the most likely reason for the current climate change?
Luda [366]

Answer:

If we could see your choices, it would better help us to help you.

Explanation:

But, if you are referring to the most widely accepted theory:

Anthropogenic (man-made) Global Warming, or AGW.  The theory states that man-made greenhouse gases, primarily carbon dioxide (CO2 ), are the predominant cause for the global warming that has occurred during the past 50 years.

5 0
3 years ago
Frequent earthquakes in an area may indicate
andrew11 [14]
Repeating earthquakes, or repeaters, are identical in location and geometry but occur at different times. They appear to represent recurring seismic energy release from distinct structures such as slip on a fault patch. ... Repeating earthquakes are observed in diverse tectonic and nontectonic settings.
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3 years ago
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