The fossa ovalis is visible in this chamber

The fossa ovalis is visible in the right atrium of the human heart.

Explanation:

The fossa ovalis is the oval-shaped depression present in right atrium of the human heart. It is the remaining portion of the thin fibrous sheet which covers foramen ovale, of the fetal heart, during the fetal development.

It is present at the same level of the interatrial septum, which is a wall that separates the left and the right atrium.  

plato users

given bodies of water

pacific / arctic / indian / southern

[ a ] the caribbean sea

[ b ] the northern ocean

[ c ] the atlantic ocean

[ d ] the barents sea

with this being the given answers

answer: accepted answer: aquatic animals use the oxygen dissolved in water to carry out respiration. since the amount of dissolved oxygen in water is low as compared to the amount of oxygen in the air, therefore the rate of breathing in aquatic animals is much faster than it is in terrestrial animals.

explanation: