Science is based on formulation and testing based on observational evidence.
Therapsids has both characteristics that possessed by mammals and reptiles.
For example :
The skull. Therapsids skull is the combination between the skulls of reptiles (that have many several bones) , and the skull of mammals
The teeth. All The teeth in a reptile usually has the same sizes. But the occipital condyle in many therapsids became double just like in mammals
hope this helps
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Answer: D. helps in digestion
Explanation: Gastric juice in the stomach contains HCL which creates an acidic condition(pH1.5-2.0) which is optimal for the action of enzymes in the stomach. HCL stops the activity of salivary amylase & helps to kill bacteria in food. It doesn’t help in digestion cuz it is not an enzyme.