![There has been an increase in the number of chambers in heart during evolution of vertebrates. Give the names of the class of vertebrates having two, three or four chambered heart. There has been an increase in the number of chambers in heart during evolution of vertebrates. Give the names of the class of vertebrates having two, three or four chambered heart.](https://d10lpgp6xz60nq.cloudfront.net/physics_images/ARH_NCERT_EXE_BIO_XI_C04_S01_031_S01.png)
There has been an increase in the number of chambers in heart during evolution of vertebrates. Give the names of the class of vertebrates having two, three or four chambered heart.
![Mammal Heart Abatomy Flat Material Design Landing Site Isolated on White Background Vector Illustration. Education Info Graphic Stock Vector - Illustration of coronary, cross: 128948750 Mammal Heart Abatomy Flat Material Design Landing Site Isolated on White Background Vector Illustration. Education Info Graphic Stock Vector - Illustration of coronary, cross: 128948750](https://thumbs.dreamstime.com/z/mammal-heart-abatomy-flat-material-design-landing-site-isolated-white-background-vector-illustration-education-info-graphic-128948750.jpg)
Mammal Heart Abatomy Flat Material Design Landing Site Isolated on White Background Vector Illustration. Education Info Graphic Stock Vector - Illustration of coronary, cross: 128948750
![Manobhav on Twitter: "@lalpathlabs Answer 3) B. 4 Chambers In humans, other mammals, and birds, the heart is divided into four chambers: upper left and right atria; and lower left and right Manobhav on Twitter: "@lalpathlabs Answer 3) B. 4 Chambers In humans, other mammals, and birds, the heart is divided into four chambers: upper left and right atria; and lower left and right](https://pbs.twimg.com/media/DbnxmR-W0AA58j9.jpg)
Manobhav on Twitter: "@lalpathlabs Answer 3) B. 4 Chambers In humans, other mammals, and birds, the heart is divided into four chambers: upper left and right atria; and lower left and right
![4 Chambers of the Heart with Human Body Stock Illustration - Illustration of signals, atrioventricular: 174971979 4 Chambers of the Heart with Human Body Stock Illustration - Illustration of signals, atrioventricular: 174971979](https://thumbs.dreamstime.com/z/humans-other-mammals-birds-heart-divided-four-chambers-upper-left-right-atria-lower-left-right-174971979.jpg)