Answer: 3) Confounding variable
Explanation:Confounding variable is the variable that indicates about the external influential factors that produces the manipulated consequences of independent and dependent variable.This variable can lead to producing useless outcomes in an experiment.
According to the question, the changes occurring in interest of student in algebra can be due to the outside factors which are not generating the actual results and thus, experiment is getting ruined.
Other options are incorrect because application variable remain same for the experiment,system variable are the variables of certain system and reliability variables describe about the variable on which dependent or stable.Thus, the correct option is option(3)
It’s true, all organic molecules contain the element carbon
The correct answer is speech impairment.
Speech impairment refers to a condition in which an individual is unable to communicate clearly and be coherently understood by others due to difficulties in their speech and articulation. Individuals with speech impairments might be unable to pronounce words correctly, produce speech sounds and speak with abnormal duration, pitch or vocal quality.
The Axis, due to the fact it had been taken over by Hitler.
