How does the eustachian tube a frog survive

They are used to equalize pressure in the inner ear while the frog is swimming. A slender tube that connects the tympanic cavity with the nasal part of the pharynx and serves to equalize air pressure on either side of the eardrum. The Eustachian tube helps the frog to bring in sound and to hear. The Eustachian tube of a frog equalizes the pressure of the inner ear by opening and closing, which aids with sound and hearing. They help to balance the frog. The Eustachian tubes also lead to the eardrums. Or instead so its simpler to remember the most important function of the frogs Eustachian tube is that...It was mainly used for equalizing pressure in the inner ear while the frog is swimming.It equalizes the pressure of the frog's inner ear while it's swimming.Used to equalize pressure in the inner ear while the frog is swimming.it gives blood Equalize pressure between inside and outside ear. We as individuals can equalize many things but i tell u this daythe frog has no tube or ear.

the earth is thought to have been formed about 4.6 billion years ago by collisions from a cloud of hydrogen, helium, rock, ice and other materials. these were pulled together by gravity to form objects in and around earth like- asteroids and small early planets called planetesimals.

so, the best possible answer to this question will be option d- to harden materials to form different parts of earth’s layers