Dynamic stretches are part of an effective warm-up because they can

lubricate muscles in the activity

decrease cardiovascular difficulty in the activity

expand lung capacity in the lung activity

build endurance for the activity

Option A, Lubricate muscles in the activity

Explanation:

Muscles become flexible during dynamic exercise. During such exercises the temperature of body increases which enhances  the flow of blood through the muscles and hence provide oxygen and glucose to muscles. Dynamic exercise provides the large amount of energy which is required by muscles in the start of any exercise/activity.  This also activates the muscles and increases the range of motion.

Hence, option A is correct

answer:

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.