some species do, but not all.
yes
it's in their pee.
A poison arrow (or other frog) does not have ears per sebut has what is called a tympanum on their head behind each eye. It picks up vibrations and transfers them into the inner part of the frog's head where the rest of the organs of hearing are located. Recall that the frog's "ears" have to work under water, and the "ear" of a frog (or toad) is completely covered by the tympanum. The frog's other hearing organs are behind the tympanum in the inner head. Got links if you want 'em.
The medial glands of the eye are sebaceous and sweat glands. These glands produce moisture to lubricate the eye.
It is called the tympanic membrane and is used for hearing.
The tympanic membrane on the leopard frog is what would be considered their eardrum. It is located directly behind the frog's eye, externally.
The frog's eye has a nictitating membrane that covers the eye and allows the frog to see underwater with ease.
frogs also produce venom and only some venom can kill and blindness is also possiblefor example - the golden dart poison frog can kill living beings instantly
The lacrimal glands are located on the superior and lateral surfaces of the eye.
they hunt for their prey, keep an eye out for predators, find shelter when they need it, sometimes they look for mates, sleep, and females find places to lay their eggs.
All sea turtles drink only seawater all of their lives. They have special glands behind each eye, called "salt glands" that they use to get rid of all the salt from the seawater.
no