If there was no plant's, what would happen to the carbon dioxide
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If there were no plants, the carbon dioxide level in the world would have risen in a much steeper way and the oxygen level would deplete in a much steeper way too.

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Without plants, Earth would cook under billions of tons of additional carbon

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

b tumor cells have a cell wall instead of a membrane

explanation:

tumor cells different from normal cells because tumor cells have a cell wall instead of a membrane.