Whether a drug is classified as a stimulant or a depressant depends upon its effect on

In the brain

Explanation:

These types of drugs work in the brain, more precisely in the central nervous system (CNS) through the control of neurotransmitters ("messenger-like" chemicals of the brain).

Depressants act by decreasing brain activity, while stimulants accelerate brain activity, both by regulating the activity of neurotransmitters(increasing or decreasing).

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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.