This Bible contradiction is from the Skeptic's Annotated Bible.
Yes, everything died except for those on the ark.
Genesis 7:21-23 View context
And all flesh died that moved upon the earth, both of fowl, and of cattle, and of beast, and of every creeping thing that creepeth upon the earth, and every man:
All in whose nostrils [was] the breath of life, of all that [was] in the dry [land], died.
And every living substance was destroyed which was upon the face of the ground, both man, and cattle, and the creeping things, and the fowl of the heaven; and they were destroyed from the earth: and Noah only remained [alive], and they that [were] with him in the ark.
No, some survived.
Genesis 6:4 View context
There were giants in the earth in those days; and also after that, when the sons of God came in unto the daughters of men, and they bare [children] to them, the same [became] mighty men which [were] of old, men of renown.
Numbers 13:33 View context
And there we saw the giants, the sons of Anak, [which come] of the giants: and we were in our own sight as grasshoppers, and so we were in their sight.