In fishes, blood enters a chamber called the sinus venosus before entering the atrium and moving into the ventricle. From the ventricle, blood enters the chamber called the .

Bulbus arteriosus

Explanation:

The heart of a fish is a two-chambered organ which works in a single cyclic way but the heart also has the entrance and exit organs.

The deoxygenated blood from the body of the fish is first collected in an entrance structure called sinus venosus from where the blood enters the atrium. The atrium passes its blood to the ventricle and before out of the heart, the blood is collected in a chamber called the Bulbus arteriosus.

The Bulbus arteriosus is a pear-shaped organ which maintains the flow of the blood to the gill in the fish.

Thus, Bulbus arteriosus is correct.

c is the answer : )               your welcome

the "power" of a lens is its resolution power, or its ability to distinguish between to closely located points. with the low power lens, it is likely you will see the rough form of the hay and maybe some movement of dots around the hay. however, when observed with the high power lens, the detailed features of the hay become visible and the microbes being grown are more clearly visible.

i hope this you