Name the two parts of the pectorial muscles.

Explanation:

Pectoralis muscle, any of the muscles that connect the front walls of the chest with the bones of the upper arm and shoulder.

1. pectoralis major and

2. pectoralis minor.

it takes hundreds of years to become stable.

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stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms