Answer:
Experimental or interventional studies compare the effect of treatments or interventions with control in humans. Placebo or different treatment(s) or intervention(s) may be used as control. Experimental studies have to be transparent and evidence-based. Two examples include clinical studies as well as observational drug studies.
Hormone Signaling. The glands of the endocrine system secrete hormones directly into the extracellular environment. The hormones then diffuse to the bloodstream via capillaries and are transported to the target cells through the circulatory system.
Diffusion and osmosis to get the minerals in and the pholem uses diffusion to transport all parts of the plant body
