There is no killing or eating carcasses in Heaven. So why would you post an Old Testament scripture about
temporal dietary laws that has absolutely nothing to do with Heaven?
As for your last question, I'm going to post some prophetic scriptures for you that talk about how in God's Kingdom there will be peace and harmony... no disease, violence or death. Hopefully it will give you at least some idea of what Heaven is going to be like.
He will wipe away every tear from their eyes.
Death will no longer exist;
grief, crying, and pain will exist no longer,
because the previous things have passed away.
Revelation 21:4
The wolf will live with the lamb,
and the leopard will lie down with the goat.
The calf, the young lion, and the fatling will be together,
and a child will lead them.
The cow and the bear will graze,
their young ones will lie down together,
and the lion will eat straw like the ox.
An infant will play beside the cobra’s pit,
and a toddler will put his hand into a snake’s den.
None will harm or destroy another
on My entire holy mountain,
for the land will be as full
of the knowledge of the Lord
as the sea is filled with water.
Isaiah 11:6-9
because the creation itself also will be delivered from the bondage of corruption into the glorious liberty of the children of God.
Romans 8:21
When the perishable puts on the imperishable, and the mortal puts on immortality, then shall come to pass the saying that is written:
“Death is swallowed up in victory.”
“O death, where is your victory?
O death, where is your sting?”
1 Corinthians 15:54-55