Answer the following question given this paragraph: Scientific experiments involve controls , or subjects that are not tested during the investigation. In this way, a scientist limits the factors, or variables that can cause the results of an investigation to differ. A variable is a factor that can change over the course of an experiment. Independent variables are factors whose values are controlled by the experimenter to determine their relationship with an observed phenomenon. Dependent variables are the observed phenomenon, and change in response to the independent variable. Controlled variables are also important to identify in experiments. They are the variables that are kept constant to prevent them from influencing the effect of the independent variable on the dependent variable. Q: Controlled variables are kept what to prevent them from influencing the effects of the independent variable on the dependent variable? Choices: - mechanical - temporary - fleeting - constant A:
constant
(Question)
Answer the following question given this paragraph: Q: How is the chance of survival affected when animals lack parental care? Choices: - variable - unaffected - increased - decreased A:
(Answer)
decreased
Ques: Answer the following question given this paragraph: Q: In an atom, what is determined by electron distribution in shells? Choices: - covalence - ionic bonds - electromagnetism - chemical behavior A:
Ans: chemical behavior
(Q).
Answer the following question given this paragraph: Zinc is an important component of many kinds of batteries. This metal is mined as zinc compounds, one of which is zinc carbonate. To obtain the pure metal, the ore must go through the following chemical processes:. Q: What are the two main components in a battery? Choices: - filter and a cathode - vortex and a cathode - anode and a vortex - anode and a cathode A:
(A).
anode and a cathode
Ques:Answer the following question given this paragraph: Diffraction occurs when waves spread out as they travel around obstacles or through openings in obstacles. Q: What is it called when waves spread out as they travel around obstacles or through openings in obstacles? Choices: - absorption - destruction - diffusion - diffraction A:

Ans:diffraction
Question: Answer the following question given this paragraph: Q: Of all the mineral nutrients, what contributes the most to plant growth and crop yields? Choices: - oxygen - methane - silicon - nitrogen A:
Answer:
nitrogen