Most fossils are of:
A. reptiles
B. birds
C. insects
D. mollusks

Mollusks

Explanation:

The shear concentration of fossilized mollusks can be explained by the ability of their shells which are comprised primarily of calcium, allowing the hard shells remain  and become fossilized long after the animal has decomposed.

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards