Answer: All the things mentioned in the question are living things.
Step-by-step explanation:
The feature that is common in all the things are that they all are living organisms. They can eat, reproduce, and digest food.
They differ in many ways , bacteria and amoeba are unicellular organism. Oak seed and seaweed are multicellular and producers as they perform photosynthesis.
Person is a multicellular organisms and lie in the category of consumer.Mushrooms are decomposers as they clean the environment.