All galaxies have a dense core of stars. Spiral galaxies, however, have arms that are often visible. There are two kinds of spiral galaxies: barred, where there appears to be a line running from arm to arm through the core, and <span>ordinary, where there is no bar. @Badbunnyhunny</span>
Answer:
a is the value of kus omak
Explanation:
Erythrocyte is the blood cell that transports oxygen throughout the body. These cells are also called red blood cells. They contain hemoglobin which gives them the red colour and also binds oxygen so as to transport it from the lungs to the rest of the body.
Answer: Fossils are used to determine the ages of rock layers. Index fossils are of organisms that lived over a wide area.