6:19 two of every sort. Two of each kind of bird, cattle, and creeping thing (the “beasts” are also included in Genesis 7:14) were to be put on the ark. Again, marine animals are omitted, as representatives of their kinds could survive outside the ark. Note that the animals were to “come unto thee.” God directed to the ark, by a miraculous selection process, those animals who possessed the necessary genes for the migratory instincts which would be needed by their survivors in the post-Flood world. Noah did not have to gather the animals himself, but merely to take into the ark two of each kind as God sent them to him.
6:21 all food. Since the pre-Flood world was essentially uniform climatologically, it was probably equally uniform ecologically, with representatives of all plants and animals located reasonably near Noah’s home base.
6:22 so did he. This simple statement summarizes a whole century of absolute obedience to God’s Word by Noah, under the most difficult and discouraging of circumstances. Not only here but three other times (Genesis 7:5, 9, 16), it is said that Noah did all God commanded him.