An organ is a structure composed of two to four types of tissues working to perform functions that are beyond the scope of an individual tissue type. A set of related organs working cooperatively toward the performance of even more complex functions constitutes an organ system.
Answer:
A.
Explanation:
Registering to vote in one's home state.
The Soviet Union launched Sputnik in October 1957.
Because there will always be water on earth, meaning that the cycle will never stop. And because the cycle is continuous and natural. I don't think anything can stop it from happening.
