Answer:
2 organisms can have the same physical traits but no matter what, every single living creature has different DNA. Like how twins can look the same but their DNA won't be exact.
Explanation:
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.
it may thats what ive read when i looked it up
