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>
Correct answer is A hope this helps
A researcher is studying the science of attractiveness and asks volunteer test subjects to rank what trait they find most attractive in a person. What type of variable is the dependent variable in this experiment?
-Categoric
Sunny~ ☺
Atoms<span> vs. </span>Ions<span>. </span>Atoms<span> are neutral; they contain the same number of protons as electrons. By definition, an </span>ion<span> is an electrically charged particle produced by either removing electrons from a neutral </span>atom<span> to give a positive </span>ion<span> or adding electrons to a neutral </span>atom<span> to give a negative </span>ion<span>.</span>
Pistil,carpel,ovary,<span>ovules</span>
