A review of experimental studies on microwave, acoustic, magnetic, and electric echo-phenomena in crystalline and amorphous structures is presented. The results of application of electron paramagnetic resonance to the study of self-organization of protozoa are reported. Feasibility of recording of seascape from the dynamics of permittivity of atmospheric layer adjacent to the water surface is demonstrated. Signals of free-field induction and echoes of permittivity produced by biological objects upon exposure to low-power light pulses are analyzed. Our recent data obtained in this line of investigation are reported.