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The driving force that pushes the root tip through the soil is primarily _____.a. continuous cell division just behind the root cap in the center of the apical meristemb. continuous cell division in the root cap at the tip of the rootc. elongation of cells behind the root apical meristemd. continuous cell division of root cap cells

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When the hoof of a galloping horse hits the ground, the digital flexor tendon in its lower leg may stretch by 5% in length, a significant stretch for this 45 cm tendon. The tendon is elastic; most--but not all--of the energy stored in the stretch is returned, which allows for efficient locomotion. In an exercising horse, the tendon may reach a temperature of 46 ºC, much higher than the horse's 38 ºC body temperature. How can you explain this temperature rise?A. The energy portion of the stretch that is not returned is converted to the heat in the tendon.B. Locomotion partially blocks the heat exchange inside the tendon leading to a temperature increase.C. The energy portion of the stretch that is not returned is converted to the locomotion, causing a temperature rise due to the friction.D. The stretch energy transformation requires additional thermal energy, which is produced in the tendon on purpose.

A thermally isolated system is made up of a hot piece of aluminum and a cold piece of copper, with the aluminum and the copper in thermal contact. The specific heat capacity of aluminum is more than double that of copper. Which object experiences the greater magnitude gain or loss of heat during the time the system takes to reach thermal equilibrium?A. the aluminumB. the copperC. Neither one; both of them experience the same size gain or loss of heat.D. It is impossible to tell without knowing the masses.E. It is impossible to tell without knowing the volumes.

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