Answer:

Explanation:
Assume both children bodies are point particles. The total moment of inertia about the rotation axis of 2 points particles of mass 16 kg and 25 kg at 1.5 m arm length is

where
are the masses of 2 children
are their distance to the center of rotation

Thermal equilibrium is a state in which all parts of a system are at the same temperature
I think b support body weight
The worm is the invertebrate. All the other animals are vertebrates.