What characteristic(s) might a human and a cat with extra sex chromosomes (XXY, share?

There can be things common if a human and cat have extra sex chromosomes (XXY) that includes they are both males  and they both have Klinefelter syndrome

In both human and cat, sex chromosome is represented as XY and because of an extra sex chromosomes (XXY) both will be male as female has XX sex chromosome.

Both human and cat will suffer from Klinefelter syndrome  because extra chromosome can cause any hormonal or genital disorder and Klinefelter syndrome is a disorder in which humans have small undescended testes or small penis.

within 30 of the equator hope this

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.