Why are soil colloids important in soils? Why are soil colloids important in soils? Soil colloids is a measure of the maximum water available for plants use after the water has drained from large pore spaces. As one of the shapes of an individual ped, soil colloids control rooting of plants. Soil colloids are an indication of soil moisture. The higher number of colloids, the greater the soil moisture is. Soil colloids have a neutralizing effect, increasing the overall alkalinity of soil and making them prime for certain agricultural crops. Without colloids, leaching will dissolve important chemicals from the soil, making them unavailable to plant.

On a backpacking trip, kenny hikes all day at a steady pace, covering 30 kilometers and burning 4000 calories. at the school track, janelle runs the 100-meter sprint in 13.5 seconds, burning 10 calories. afterward, janelle’s leg muscles are aching and she is breathing hard, while kenny maintains normal breathing all day, even though he burns 400 times more calories than janelle. which two statements offer the best explanation for this phenomenon? a. if the aerobic pathway—cellular respiration—cannot meet the energy demand, then the anaerobic pathway—lactic acid fermentation—starts up, resulting in lactic acid buildup and "oxygen debt." b. aerobic cellular respiration produces more energy, but its use is limited because of lactic acid buildup in the muscles and the resulting "oxygen debt." c. after about 90 seconds of intense exercise, the muscles become depleted of oxygen, and anaerobic respiration can no longer function to produce atp, resulting in "oxygen debt." d. the rate of energy demand determines how the muscles will obtain energy, either from cellular respiration or from lactic acid fermentation if not enough oxygen is present.