The answer is protect the body from infection by pathogens
The physical barrier is made of epithelial cells, mostly will be keratinized to increase their sturdiness further. They will impede the pathogen physically by barricading the cells, makes the pathogen could not invade deeper part of the body. Histamine and antibodies should be the role of immune cells, not epithelial.
Answer: When the non native species is introduced into the forest then the squirrel should compete with the stronger animals present in the forest for the sake of resources.
The squirrels in this case will not win from the native species present there and ultimately the population of squirrel will decrease.
The population of squirrel will get extinct at a time and would not be considered as an invasive species.
I believe the answer you're looking for is photosynthesis, where plants release oxygen and humans use this to release carbon dioxide to the plants.
Answer:
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Explanation:
