yet there are so many other genes in closely related creatures that break this link as well. Or there are genes that are shared in unrelated creatures which link them closer together.
First, all creatures are related. That's what universal common ancestry is all about.
Second, your claims don't apply to complex eukaryotes. All of the examples you have given are not true.
It seems the same vitamin C loss that is used to link apes and humans together to show common ancestry is also found in not so closely related creatures as well like bats, guinea pigs and passerine birds.
No, it isn't. The mutation that knocked out the vitamin c gene in humans and apes is not found in guinea pigs and passerine birds. Guinea pigs and passerine birds have a different mutation and the expected differences between the genes with respect to DNA sequence. Your example completely fails.
Upvote
0