Answer: The statement is correct in scientific sense.
Explanation:
Adaptation refers to the traits or characteristics posses by living organisms which enable the organisms to be better fitted to survive, and reproduce in it's environment.
Adaptation is an evolutionary process I.e. features are evolved by the organisms to be better suited in it's environment.
From the statement, an individual crab develop characteristics that enable it to change its position which enable it upright stance to further adapt to life in land.