Most mammals can’t get scurvy. They make their own Vitamin C. But in primates, the gene to make it is broken. Normally, when an important gene breaks, the organism dies and has no surviving descendants, but when it broke a few million years ago, our ancestors were living in a lush climate with lots of fruit and survived the failure just fine.
Then humans invented fire and clothing, and moved to colder climates where fresh food was only available part of the year, and scurvy was born.
And our reproduction, oh heavens. There are SO MANY WAYS that human reproduction is fucked up that simply DO NOT APPLY to other animals, even the our nearest relatives, the great apes. When a gorilla is giving birth, she finds a nice hiding place in the trees, squats down for like half an hour, and pushes out a baby. Humans, not so much. In fact, the outcomes of unassisted childbirth in humans are so poor that most anthropologists agree that we must have invented midwifery in some form before we became fully human.