Using the scientific method, a(n) must be tested as the focus of any experiment. law observation hypothesis conclusion

Hypothesis

Explanation:

Hypothesis is the part of the scientific method, that is required to be tested as the focus of any experiment. An hypothesis can be define as the presumed explanation on the basis of limited evidences for the cause of natural phenomena occurring on earth. It includes statements which are required to be proved using suitable methodology.

since there are no options posted i'll give you a few examples.

a dolphin's flipper, bird's wing, cat's leg.