The controlled experiments are performed by the scientists, when they want to study the changes in the sample on changing a single variable. So, the correct answer is option (b).
In case, all variables are kept same, no changes would be observed in the experiment sample. A controlled experiment can be performed on living thing as well as non living. But, controlled experiment cannot be performed on the things which are influenced by a lot of variables, as they cannot create realistic results. So, the option (a), (c), and (d) are incorrect.
The fruit I think
Hope this helps :))
I think the answer is ATP
Ph of water is typically a Ph of 7 AKA...or neutral.
The Ph scale goes from 14 being base to extremely acidic 0.
Typically a Ph lower than 7 is considered acidic.
7 is the neutral zone.
Water depending from where you get the liquid can range between
6.5 ph to 8.5.
Usually 7 neutral!
