If the mass of an object is decreased, its gravitational force will decrease decrease by the distance squared increase increase by the distance squared

The answer is: decreace.

Gravity as a force which causes any two bodies to be attracted to each other.  

The gravitational effect increases as the size of an object increases.  

The force of gravity between two objects is directly proportional to the mass of objects and inversely proportional to the square of the distance that separates the centers objects.

If the mass of one of the objects is doubled, then the force of gravity between them is doubled.

the answer is d.) homologous; have mammary glands