Exercise 1.
1 several main systems
2 which join them
3 the main function
4 with all the necessary means
5 are carried by the blood stream
6 the air passages leading to them
7 where it can enter the blood stream
8 convey the urine away from the kidneys
9 until it is discharged
10 produce regulatory substances
Exercise 1.
1 several main systems
2 which join them
3 the main function
4 with all the necessary means
5 are carried by the blood stream
6 the air passages leading to them
7 where it can enter the blood stream
8 convey the urine away from the kidneys
9 until it is discharged
10 produce regulatory substances