Question

for which question could a scientist develop a testable hypothesis?
which grocery store is the best?
when will dinosaurs roam earth again?
do all kinds of wood float in water?
should everyone use solar - powered cars?

Explanation:

A testable hypothesis is one that can be proven or disproven through experimentation or observation.

• The question "Which grocery store is the best?" is subjective as "best" can be defined in many ways (price, quality, service etc.) and is not objectively testable.
• The question "When will dinosaurs roam Earth again?" is about a future event that we have no scientific basis to test currently.
• The question "Do all kinds of wood float in water?" can be tested by taking different kinds of wood and placing them in water to observe if they float.
• The question "Should everyone use solar - powered cars?" is a matter of opinion and policy rather than a scientific testable question.

Answer:

Do all kinds of wood float in water?