<span>B) The cold front advances without bringing any change in the weather.</span>
Independent Variables can be manipulated, and a Dependent Variable are observed and measured. Another way to say it is that the Independent variables change to get different results while the Dependent variables never change because you are trying to see what causes it to change
D. <span>controlled
is the right answer because a</span><span>n </span>experiment<span> in which an observer tests a hypothesis by looking for changes carried by alterations to a variable.</span>
In this case the answer is fuel
C, Both types of organisms contain exactly the same four nitrogen bases, but in different sequences and numbers.
