To solve this problem, we need to identify the process in which CO$_2$ is not released. Let's analyze each option:$\newline \bullet$Option 1: Aerobic respiration in plants$\newline$ - In aerobic respiration, glucose is completely oxidized to CO$_2$ and H$_2$O, releasing energy.$\newline$ - Therefore, CO$_2$ is released in this process.$\newline \bullet$Option 2: Aerobic respiration in animals$\newline$ - Similar to plants, aerobic respiration in animals also involves the complete oxidation of glucose to CO$_2$ and H$_2$O.$\newline$ - Hence, CO$_2$ is released in this process as well.$\newline \bullet$Option 3: Alcoholic fermentation$\newline$ - In alcoholic fermentation, pyruvate is converted into ethanol and CO$_2$.$\newline$ - Therefore, CO$_2$ is released in this process.$\newline \bullet$Option 4: Lactate fermentation$\newline$ - In lactate fermentation, pyruvate is converted into lactate without the release of CO$_2$.$\newline$ - Therefore, CO$_2$ is not released in this process.$\newline$Based on the analysis, the correct option is Option 4: Lactate fermentation, where CO$_2$ is not released.