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WINSTONCH [101]
3 years ago
6

The main source of organic matter in soil is _____.

Biology
2 answers:
Bas_tet [7]3 years ago
8 0
The answer is plantsssss
Vesna [10]3 years ago
7 0

<span>Plants are the main source of organic matter in soil.</span>

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Which of these planets has water ice near its poles?
sergejj [24]

Answer:

Mars

Explanation:

The Deep Freeze: Ice on Mars. Like Earth, Mars has ice caps at its poles. Water reaches the poles as vapor and is frozen into thin layers that build up thick deposits. Mixed with this water is dust picked up by the wind, so the caps have bright and dark layers of "clean" and "dirty" ice.

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Natural selection is least likely to be the cause of a change in a population's allele frequencies when:
cricket20 [7]
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All bony fish have segmented fin rays that are derived from their epidermis and sutures in their neurocranium. Both bony fish and cartilaginous fish have gills for breathing, but the gills of bony fish are protected by a hard, bony plate. Bony fish may also have prominent rays, or spines, in their fins; this characteristic is known as a "operculum".

Bony fish, in contrast to cartilaginous fish, have swim or gas bladders to control their buoyancy. On the other hand, cartilaginous fish require constant swimming to maintain buoyancy.

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3 0
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Two well-understood sncrnas in eukaryotic cells are:
Nataly_w [17]
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