Three things that effect a life system would be
- sunlight
-water
-energy/food
Hope this helps
I don't know about it your answer will give another people
You want to draw a free body diagram of the forces on the sled in the horizontal x-direction.
If you visualize the system in an x-y coordinate plane, the force along the x-direction is the angle it makes with the x-axis multiples by the force.
The angle made with the x-axis is cosine of the angle theta.
Please see picture attached.