Why do many scientists work in groups? a.
To generate new ideas
c.
Because it is too expensive to work on their own
b.
To make sure that the work is accurate
d.
So there is always someone in lab to monitor experiments

I well say to make sure that the work is accurate

Explanation:

I hope this is right

the displacement produced by the body.  

the amount of force subjected to the body.  

the angle between the direction of force and displacement

1) estimating temperature to the nearest tenth of a degree

2) estimating the mass of the sample to the nearest tenth of a gram

4) the position of the cups of sand and water under the heat lamp