1)
From where do we know that the bull is burned in its entirety ? together with the insides, sinews, horns and hoofs?
1.
Ramban #1: They are included in "ha'Par".
2.
Ramban #2 and Moshav Zekenim: The word "ve'Es ha'Par" includes them.
2)
Since when is a Chatas Chitzonah (whose blood is sprinkled on the outer Mizbe'ach) entirely burned?