Immature bone cells, or osteoblasts , manufacture a protein called osteoid as well as several hormones. because of this, we would expect osteoblasts to contain numerous

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