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To study the dust obscured phase of the galaxy evolution during the peak ofthe Star Formation Rate (SFR) and the Black Hole Accretion Rate (BHAR) densityfunctions ($z = 1 - 4$), rest frame mid-to-far infrared (IR) spectroscopy isneeded. At these frequencies, dust extinction is at its minimum and a varietyof atomic and molecular transitions, tracing most astrophysical domains, occur.The future IR space telescope mission, SPICA, fully redesigned with its $2.5\,\rm{m}$ mirror cooled down to $T < 8\, \rm{K}$, will be able to perform suchobservations. With SPICA, we will: 1) obtain a direct spectroscopic measurementof the SFR and of the BHAR histories, 2) measure the evolution of metals anddust to establish the matter cycle in galaxies, 3) uncover the feedback andfeeding mechanisms in large samples of distant galaxies, either AGN- orstarburst-dominated, reaching lookback times of nearly 12 Gyr. SPICA large-areadeep surveys will provide low-resolution, mid-IR spectra and continuum fluxesfor unbiased samples of tens of thousands of galaxies, and even the potentialto uncover the youngest, most luminous galaxies in the first few hundredmillion years. In this talk a brief review of the scientific preparatory workthat has been done in extragalactic astronomy by the SPICA Collaboration willbe given.

Unveiling the physical processes that regulate Galaxy Evolution with SPICA observations