Final answer:
Investigations seek to answer fundamental questions that can be scientifically tested and falsified. The exact number of such questions varies depending on the investigation. Subjective questions do not lend themselves to the scientific method.
Step-by-step explanation:
All investigations seek answers to a set number of fundamental questions to explore, test, and understand various phenomena. When considering if a statement lends itself to investigation using the scientific method, it's important to determine if the hypothesis can be falsifiable. For example, questions like 'Are hummingbirds attracted to the color red?' can be tested and have empirical evidence collected, demonstrating a question that can be addressed through scientific means. Referring to the question posed regarding how many fundamental questions are sought by all investigations, the answer is not provided directly in the referenced information. However, the context suggests that the number of questions depends on the nature of the investigation and may go beyond a fixed count.
It is often said that part of discovery is knowing which questions to ask, and indeed the act of asking can sometimes reveal the answer. Hence, fundamental questions are essential in investigating scientific theories, such as the natural origin of life or the beginnings of time and space. While some questions are subjective and not suited to the scientific method, others can be rigorously tested. Although the specifics vary by field and inquiry, the importance of fundamental questions in investigations is paramount.