Plz help am about to be done!

Laboratory experiments, observational field studies, and model-building are all examples of different forms of scientific investigations.  in what way do laboratory experiments primarily differ from other forms of scientific investigations?   a.  a laboratory experiment is the only accepted form of investigation within the scientific community.  b.  studies about how things behave in nature or studies involving very large objects are best answered through laboratory experiments.  c.  laboratory experiments involve the identification and control of variables.  d.  data can only be generated through laboratory experiments, not other forms of investigation.

According to newtons universal law of gravitation, which would change the parh of the ball so it traces out widest curved path possible?

In positive numbers less than 1, the zeros between the decimal point and a non-zero number are blank significant