HELP Select all that apply.
Civilizations throughout Meso-American were marked by:

Several rulers throughout the empire.
The use of cacao bean as money.
Landowners were called calpulli.
The arrival of the Spanish.
By temples such as Machu Picchu.

donald carl johanson (born june 28, 1943) is an american paleoanthropologist. he is known for discovering – with yves coppens and maurice taieb – the fossil of a female hominin australopithecine known as "lucy" in the afar triangle region of hadar, ethiopia.

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in classical conditioning the organism learns to associate new stimuli with natural, biological responses such as salivation or fear. the organism does not learn something new but rather begins to perform in an existing behavior in the presence of a new signal. operant conditioning, on the other hand, is learning that occurs based on the consequences of behavior and can involve the learning of new actions.