Answer:
1. Ask a question
2. Make a hypothesis
3. Conduct experiment
4. Make observations and record them
5. draw conclusions
6. write a conclusion
Explanation:
The food sources available for a particular species in an ecosystem. Also space where they can live and reproduce, but food is the main factor.
They are dangerous to the environment because they have no natural competition. That being said they have nothing to keep their population in check, therefore, taking away food, and habits from all the other species. Thus, causing species to die out, which in turn ruins the food chain.
Its the the number of proteins and neutrons in the atom.