One muscle can produce a variation of smooth forces called . And they're generally affected by both the and with which they're stimulated

One muscle can produce a variation of smooth forces, called graded muscle responses. And they’re generally affected by both the frequency and strength with which they’re stimulated

Explanation: Muscle fibers are a collection thousands of fibers responding to a single action from a neuron to form a motor unit which can  either be large motor units controlling activities like walking and small motor units controlling activities like blinking the eye. These muscle movements are smooth and produce smooth forces called  The graded muscle responses which depends on the magnitude of forces  in  releasing and contracting of muscles when carrying out an activity. The force exerted by the  graded muscles responses depends on the energy exerted ---strength and number of times, such muscle is used ---frequency.

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the water molecules are transferred from the roots to the stem or top parts of the tall tree because of important properties of water which are adhesion, cohesion and capillary action. cohesion is the property of water molecules keeps water molecules in a combined state by sharing of bonds between them at the atomic level. adhesion allows the interaction of water molecules with other substances or substrate. adhesion will cause the attachment of water molecules to the wall of the vessel (xylem) of the plant. capillary action occurs when the adhesive force to the vessel wall is stronger than the cohesive force between water molecules. capillary action mimics the transfer of water from a tube or pipe. in this way water utilizes its property to transfer water from down to top level of the plant.