Sam wants her cat, mr. whiskers, to run into the kitchen for tuna when he hears the electric can opener. however, sometimes sam opens canned vegetables for herself instead of tuna. would explain the most likely reason mr. whiskers would not associate the sound of the can opener with the tuna.

Because of the fact he doesn't always get food

Explanation:

The reason why is he doesn't always get food when he hears the can opener sometimes its vegetables

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answer: after carbon dioxide enters the leaf through stomata it moves into the mesophyll cells where photosynthesis occurs and glucose is constructed. respiration occurs when glucose (sugar produced during photosynthesis) combines with oxygen to produce useable cellular energy.

explanation:

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