Explanation:
When a soil lacks earthworm, it will be poorly aerated and organic matter will be lacking.
Earthworms burrow through the soil and leaves holes and pores around in the soil.
- Soil air is an important component that makes up the soil.
- Earthworm are good burrowers that penetrates the soil and creates pores.
- This facilitate infiltration of water into the soil and also the circulation of air.
- Also, since they are decomposers, they the leave the soil rich and filled with organic matter.
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Mass of an atom=number of protons + number of neutrons.
mass of this atom=10 + 13=23 amu (amu=atomic mass unit).
Answer: 23 amu
Displacement reaction is a chemical reaction in which a more reactive element displaces a less reactive element from its compound. Both metals and non-metals take part indisplacement reactions. Example :Reaction of iron nails with copper sulphate solution.AB + C → AC + B
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