Bacteria are the simplest single cells that carry out all basic life activities.
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Scientist are still trying to find out it's a theory atleast I think it is
Answer:
Explanation:
The immune system is there to develop a strong answer for infections and diseases that can occur in the body. The system is comprised also of gastrointestinal immune cells. These cells secrete lymphocytes that are there to attack whatever is attacking our body. The gut immune cells and the microflora located inside it are responsible for preventing the growth of other microbes that are bad for us in the gut and to fight ingested pathogens that we can get on our food.
Answer: Option C) organ
Explanation:
An organ is made up of similar tissues performing the same function e.g skin.
The skin is an organ (sense organ) composed of several kinds of tissues that all help to protect the body from invaders
