Which of the following statement about circulatory system of frog is correct?
1
The vascular system of frog is open type.
2
Lymphatic system is absent in frogs.
3
Heart is three chambered, two atria and one ventricle and is covered by a membrane called pericardium.
4
Special venous connection between kidney and lower parts of the body are present in frogs is called hepatic portal system.