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Answer 1

Answer:

Presence of air in soil is essential for plants because roots of plants absorb oxygen from soil for the growth of the plants. If soil lacks air, plants growing in it will die.In nutrient management, soil aeration influences the availability of many nutrients. Since plant roots require water and oxygen (from the air in pore spaces), maintaining the balance between root and aeration and soil water availability is a critical aspect of managing crop plants.

Step-by-step explanation:

Presence of air in soil is essential for plants because roots of plants absorb oxygen from soil for the growth of the plants. If soil lacks air, plants growing in it will die.In nutrient management, soil aeration influences the availability of many nutrients. Since plant roots require water and oxygen (from the air in pore spaces), maintaining the balance between root and aeration and soil water availability is a critical aspect of managing crop plants.

Answer 2

Answer:

$( \frac{ {a}^{5} }{ {a}^{3} } ) \times {a}^{8}$

$\frac{ {a}^{5 + 8} }{ {a}^{3} }$

$\frac{ {a}^{13} }{ {a}^{3} }$

${a}^{13 - 3}$

${a}^{10}$