Samantha, a three-year-old girl, showed stunted growth. She weighed only 22 pounds and was much shorter than most of her peers six months ago. She was treated for failure to thrive. She is now returning to her normal growth rate, and her weight is showing an increase. Which of the following phenomena does this scenario represent?
A) Canalization
B) Myelination
C) Differentiation
D) Habituation

a.  Canalization

Explanation:

Canalization -

It refers to the type of evolutionary robustness , which is the ability of the population to produce the similar phenotype regardless of the variability of the environment or the genotype , is referred to as canalization .

It is the method to generate specific genotype in order to follow the same pathway under various conditions .

Hence , from the given scenario of the question ,

The correct answer is a. canalization .

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.        

can you tell me where are the ansawer choices