participation in Federal programs and regulatory, quasi-judicial and temporary agencies established by law, which may, but need not be allocated to an executive department. The Legislature shall by law prescribe the functions, powers and duties of the principal department and of all other agencies of the Territory and may from time to time reallocate offices, agencies and instrumentalities among the executive departments, may increase, modify, diminish or change their functions, powers and duties and may assign new functions, powers and duties to them; but the Governor may make such changes in the allocation of offices, agencies and instrumentalities, and in the allocation of such functions, powers and duties, as he considers necessary for efficient administration. If such changes affect existing law, they shall be set forth in executive orders, which shall be submitted to the Legislature while in session, and shall become effective, and shall have the force of law sixty days after submission, or at the close of the session, whichever is sooner, unless modified or disapproved by a resolution concurred in by a majority of all the members of the Legislature.