1. Explain what it means to be a citizen
2.distinguish the difference between legal and illegal aliens
3. Identify the criteria for American citizenship
4.examine the process of naturalization

Here u go

Explanation:

Naturalization is the process through which an immigrant to the United States can become a U.S. citizen. Only certain immigrants are eligible: those who either have been green card holders (permanent residents) for 3–5 years or meet various military service requirements.

Becoming an American citizen comes with many advantages, and it also means taking on new responsibilities.

This guide will help you understand how to become a U.S. citizen, including the requirements for U.S. citizenship, the whole application process, and the rights and obligations of a naturalized citizen

They can affect the DNA of living things over time.

They occur in thousands of years or within billions of years.

They affect the populations and species more slowly then short term changes .

Explanation:

The long-term environmental changes are slow and gradual changes in the environment. This gives the population of the species the opportunity to adapt. These occur on Earth over thousands of years.  The gradual changes affect the body form and function of living beings. The gradual changes can affect the instructional machinery like DNA synthesis and its function.  Such changes develop unnoticeable and undetected symptoms in species. The fluctuation of climate in a region over thousand years can bring a catastrophic hazard like cyclone.