I am human. = I behave like human beings usually do. I have feelings, emotions, fears, desires, needs etc... (With the underlying idea that I am not an animal) I am a human. = I am an animal of the species H.... Sapiens, which belongs to the genus H..... We are also mammals, who belong to the subgroup primate. Primates are a subgroup of the great apes. I have deleted the letters of the word above beginning with the letter H., because this Latin word can also been used as a type of insult, and cannot be used on this app. However I am, of course using it with its original meaning as a scientific term...

In a basic sense, they mean the same thing. They both tell you that the speaker is a human being. However, being "human" (without the article) can also mean experiencing the common emotions and life events that most people experience in human culture. "It's only human to feel that way" means "it's completely normal to feel that way, because that's how most people feel." "Being human" can mean participating in human society, or having normal human flaws, desires, reactions, etc. "What can I say, I get angry sometimes. I'm human." (Meaning: it's normal to get angry sometimes.) "I am *a* human" is more likely to refer to the species of humans in a scientific sense. "He's *a* human" probably means that he is literally a human being, not a dog or a fish or a tree. ("He's human," with no article, can *also* mean "he's a human and not any other type of creature." You would have to look at the context of the sentence to find out if "he's human" means he is literally a human being, or if it means he is a normal person who has normal human desires, faults, and so on.)

Sadly there is an article in english language: So i am human is simply not correct. Watch a video or read about Articles in english.

A human means any person who is alive, human means collective noun to describe the whole species

In 1. human acts as an adjective - the condition of being human. In 2. it is a simple fact - I am a cat/I am a human / I am a person.