Is the statment the smaller the animal ,the simpler the animal true?

Not necessarily. An animals size dosent have to do with its personality.

Explanation:

For example mice are used in many lab expirements because their bodies resemble humans! That's not simple!

It is not true like mice

Explanation: a rat consits of 223 bones which is 17 more then the count of normal adult human bones.

answer; ///(b) it is composed of four protein chains and four heme groups;

true is the