What does the ninth amendment ensure?

In which research method does a researcher change the value of one variable to determine how the change affects another variable? a. experiment b. observational research c. survey d. case study

If an atom has 35 protons in the uncles , how many elements will it have orbiting the nucleus

Which were accomplishments of jane addams? check all that apply. she established hull house. she founded the sierra club. she served on chicago’s board of education. she published a book of photographs showing the urban poor. she won the nobel peace prize in 1931.