Answer:
B ) Valves
Explanation:
Valves allow blood to flow only in one direction and prevent the backflow.
Answer:
nice.....................
Explanation:
yes
Answer:
Between mars and Jupiter
Explanation:
between mars and jupiter is where the astriod belt is located. (between the rock and gas planets)
Explanation:
The Precambrian covers almost 90% of the entire history of the Earth. It has been divided into three eras: the Hadean, the Archean and the Proterozoic. The Precambrian Era comprises all of geologic time prior to 600 million years ago.
