It's frequently claimed by Creationists that we've only ever seen microevolution, which they define as a variation within a "kind", not macroevolution, which they define as a change to a different "kind". But what is a "kind". It's never well defined, and ranges from a species (humans) to a kingdom (bacteria). A "kind" is not a valid taxonomic rank.
Biologists usually use microevolution to mean evolution above the species level, which has been observed!
Apple maggot flies, ecoli capable of eating nylon and using citrate. (EDIT: my mistake it was originally flavobacterium they found were able to eat nylon, but they were able to experimentally induce it into another species of bacteria, and were later able to transfer it to Ecoli via plasmid transfer, so there still is nylon eating bacteria.) Inability to use citrate is one of the ways biologists use to define ecoli from other species.
Really creationists just use "kind" to count anything observed as merely being microevolution.
So how big is a kind really?
EDIT2: Changed christian to creationist.
Biologists usually use microevolution to mean evolution above the species level, which has been observed!
Apple maggot flies, ecoli capable of eating nylon and using citrate. (EDIT: my mistake it was originally flavobacterium they found were able to eat nylon, but they were able to experimentally induce it into another species of bacteria, and were later able to transfer it to Ecoli via plasmid transfer, so there still is nylon eating bacteria.) Inability to use citrate is one of the ways biologists use to define ecoli from other species.
Really creationists just use "kind" to count anything observed as merely being microevolution.
So how big is a kind really?
EDIT2: Changed christian to creationist.
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