diffussion of responsibility
The family group live together, take meals together and share the same home. The non-related groups are people brought together by common interest.
Get two mobs of the same kind together in a pen and feed them wheat. Hearts come out and they start bouncing each other and then there's baby mobs. Note you can only do this with passive mobs so you can't go around making baby creepers lol. For hostile mobs make a room without any light in there so they can spawn, and every now and again go in there and kill them
Pokémon do not have to be the same species to breed however they must be of the same egg group. For example, Pikachu is part of the Field and Fairy egg groups and can only breed with other members of these groups, such as Rattata and Clefairy respectively. For more info about Breeding and Egg Groups, please see the Related Links.
Friendly mobs are animals or creatures that don't attack at sight. Ex. Pig, sheep, cow, chicken, and squid. Also, wolves won't attack unless provoked. Same goes for spiders during the day.
No creatures live in lava, lava damages all mobs in the same way as normal people.
I recommend an older work on this topic; "The Crowd" by Gustave le Bon. He, like others since, postulate that a mob forms around a person or a singular event (in much the same way as a particle in a super-cold solution can make it harden instantly) which causes the formation of the mob. The mob follows it's own rules (like all chaotic 'systems') and they are almost never the rules of the individuals making up the group.
political systems
The groups have equal number of valence electrons. The elements in same groups have same chemical properties.
the number of participants in both groups are usually the same
Groups share same valence electron. Their chemical property is also same.
it completes the organ system
The ACLU and the NAACP are among those groups that support same-sex marriage.