The correct answer is that mammals use a closed, double loop , four chambered heart as a circulatory system of the body.
The circulatory system of mammals is closed system that consists of four chambers, two articles and two ventricles. The deoxygenated blood comes into the heart from one loop and the oxygenated blood from other loop from the heart is circulated to the whole body. This is called as double circulation.
The right answer is meditation.
Meditation is a very ancient spiritual, mental and postural practice. During meditation, the individual comes to an introspection and a long reflection on himself.
Meditation finds its origin in the East, but also in the Buddhist tradition. The practice of meditation allows you to control negative emotions and refocus your mind.
6. a, 7. c, 8. b , 9. e , 10. d , 11. e, 12.c
There are 5 levels of cell organization recognized by biologists.
