...as their most important service to man.
Animals also (2) ___SERVE = (Ý DIỄN ĐẠT Ở ĐÂY LÀ CÓ ÍCH VỚI)________ man by supplying him with many foods and other useful products. (3)____WITHOUT = THIẾU_______ animals, man would have no meat, milk, eggs, or honey, or wool, fur, or silk.
For...