A consistent question that appears on my question facility on this web page is: "How did Noah get all the different species on the Ark?" To answer this question we must understand the difference between "kinds" of creatures and species. A "kind" is a group of creatures that are similar and have the same number of chromosomes. Each "kind" would represent great variety. For example a pair of dogs would represent the dog kind including wolves, coyotes, dingoes, etc. Not two Great Danes, two Poodles, two Daschund, two Timber Wolves, two Chihuahua, two whatever... Evolutionists agree that the great variety of domestic dogs come from a common ancestor. That animal had great genetic richness that was lost as the generations progressed. Let me explain how genetics works so we can understand how just one pair of individuals could parent a vast array of different individuals. Each gene, there are millions in most creatures, come in pairs for each individual. One comes from the father and the other from the mother. Genes come in two kinds, dominant (Capital Letters) and recessive. Typical Gene pairs could be 'AA' or 'Aa' or 'aa'. This chart illustrates how information is lost in each generation.
The original creations of each kind by God would have a dominant and a recessive gene in every case. Here is Dr. Gary Parker writing in the book "Creation; Fact of Life" answering this question. "Could there be enough variation in two created human beings, for example, to produce all the variation among human beings we see today? Answer: 'Yes, indeed; no problem!' I get some help here from an unexpected source, evolutionist Francisco Ayala. He says that human beings are "heterozygous" for 6.7% of their genes on the average. That means that 6 or 7 times in a 100, the pair of genes for a given trait differ, like the genes for free or attached ear lobes, or for rolling or not rolling the tongue. Now this may not seem like much. But Ayala calculates a single human couple with just "63% variety" could produce 10 (to the) 2017th power children (mathematically, not physically!) before they would run out of variation and have to produce an identical twin. That's a I0 followed by 2,017 zeroes! The number of atoms in the known universe is a mere 10 (to the) 80th power (10 followed by 80 zeros), nothing at all compared with the variety that is present in the genes of just two human beings!"
The great variety in Biblical kinds is not even close to the possibilities that God built into the genetic system. Humans as diverse as we have only one set of parents, Adam and Eve, with genetic diversity to make us all. WOW! God is amazing.
Suggested resources:
"Creation: Facts of Life"
"The Wonders of God's Creation" (3 video series)