Which of the following statements best describes the importance of investigations in science?
a. investigations are hand-on and interesting
b. investigations often require testing multiple variables.
c. investigations often keep many people employed.
d. investigations can lead to discoveries that can change the world.
10 points will be rewarded

The correct option is D.
Investigation is very important in the world of science because you never know what you might find. Due to investigation, scientists may make discoveries that will be of immense benefits to humanity. Think of how great it will be if scientists can discover drugs that will be taken within one week and which will cure HIV and cancer permanently.

Alpha particles have positive charge, beta particles have negative charge, and answer 4 just doesn’t make sense. thus, you are left with only one possible answer.

Wagons/motorized vehicles