anastasia wrote:i would say "has appeared"
this says that the dragon appeared in buddha's biography sometime before now - the time is not important.
"winona ryder has appeared in many movies"
(this is "present perfect" tense.)
this was one of those posts i made and then went to bed, woke up three hours later, going, "Wait! why did i say that?"
i do agree with the basic advice - it depends on where the emphasis is.
the reason i said "has appeared" was the words "the biography" - i assumed it was supposed to be plural. i've not heard of one official biography of the buddha. (compared with the bible, for example) it was a silly assumption/oversight, and was the thing that woke me up.
at any rate, as the sentence is written, the verbs should agree with one another.
so you could say "it appears" and "it is" - and this would give the impression that those two things are true today. if you pick up the biography of the buddha, you will see a dragon. if you ask a buddhist today which animals protected (sic - so in the past) buddhist law, they will mention the dragon. (but they will be saying that these animals no longer protect buddhist law) - this is maybe the best way to present the sentence.
if you say "it appeared" and "it was" - i think the emphasis is on historical relevance.