Here are some scriptures that might help (Taken from another thread and slightly edited).
Death is fundamental to the Gospel's efficacy. If sin didn't bring on death, there was no need for Christ to literally conquer death through His physical resurrection. The entire Jewish sacrificial system that was a typology of Jesus Christ, required shedding of blood for the covering of sin.
God's first act after pronouncing the curse for Adam's sin was to sacrifice an animal (the first animal death was to cover Adam and Eve's sin).
Gen 3:21 Unto Adam also and to his wife did the LORD God make coats of skins, and clothed them.
Death was not part of the original creation. Getting back to the original creation.
Isa 11:7 And the cow and the bear shall feed; their young ones shall lie down together: and the lion shall eat straw like the ox.
Isa 65:25 The wolf and the lamb shall feed together, and the lion shall eat straw like the bullock: and dust [shall be] the serpent's meat. They shall not hurt nor destroy in all my holy mountain, saith the LORD.
Jesus Christ shed is sinless blood and therefore gave up his life unto death, because He is God, He was able to take up His life again from the dead so that, like Him, we can have eternal life.
As Paul clearly states, Jesus Christ's death and resurrection, overcame the penalty of death brought on by Adam's sin. If evolution was true, Jesus Christ would have had no reason to resurrect Himself because He could have become a spirit being and went straight to heaven.
Sin brought death into the world, and death needed conquering by the shedding of sinless blood. Jesus Christ allowed His life's blood to pour out for us. He had the power to lay down His life for His friends.
On death, shed blood and sin:
Gen 2:17 But of the tree of the knowledge of good and evil, thou shalt not eat of it: for in the day that thou eatest thereof thou shalt surely die.
Lev 17:11 For the life of the flesh [is] in the blood: and I have given it to you upon the altar to make an atonement for your souls: for it [is] the blood [that] maketh an atonement for the soul.
Mat 26:28 For this is my blood of the new testament, which is shed for many for the remission of sins.
Rom 5:9 Much more then, being now justified by his blood, we shall be saved from wrath through him.
Luk 24:39-40
39 Behold my hands and my feet, that it is I myself: handle me, and see; for a spirit hath not flesh and bones, as ye see me have.
40 And when he had thus spoken, he shewed them [his] hands and [his] feet.
41 And while they yet believed not for joy, and wondered, he said unto them, Have ye here any meat?
Rom 5:12 Wherefore, as by one man sin entered into the world, and death by sin; and so death passed upon all men, for that all have sinned:
Rom 6:23 For the wages of sin [is] death; but the gift of God [is] eternal life through Jesus Christ our Lord.
Jhn 15:13 Greater love hath no man than this, that a man lay down his life for his friends. (emphasis added in scripture text)
I think I missed the quote that said that animals had immortality prior to Adam.
Plants are not considered alive in Biblical terms. The word wither is used to describe the decay of plants. Which is handled by different Hebrew words than the death of an animal or human.
Hebrew for 03001
yabesh {yaw-bashe'}
Outline of Biblical Usage
1) to make dry, wither, be dry, become dry, be dried up, be withered
a) (Qal)
1) to be dry, be dried up, be without moisture
2) to be dried up
b) (Piel) to make dry, dry up
c) (Hiphil)
1) to dry up, make dry
a) to dry up (water)
b) to make dry, wither
c) to exhibit dryness
Hebrew for 05034
nabel {naw-bale'}
Outline of Biblical Usage
1) to be senseless, be foolish
a) (Qal) to be foolish
b) (Piel)
1) to regard or treat as foolish
2) to treat with contempt
2) to sink or drop down, languish, wither and fall, fade
a) (Qal)
1) to sink or drop down
2) to fall, wither and fall, fade
3) to droop
Here are the words for death of an animal or human.
Hebrew for 04194
maveth {maw'-veth}
Outline of Biblical Usage
1) death, dying, Death (personified), realm of the dead
a) death
b) death by violence (as a penalty)
c) state of death, place of death
Hebrew for 04191
muwth {mooth}
Outline of Biblical Usage
1) to die, kill, have one executed
a) (Qal)
1) to die
2) to die (as penalty), be put to death
3) to die, perish (of a nation)
4) to die prematurely (by neglect of wise moral conduct)
b) (Polel) to kill, put to death, dispatch
c) (Hiphil) to kill, put to death
d) (Hophal)
1) to be killed, be put to death
a) to die prematurely
Lev 17:11 For the life of the flesh [is] in the blood: and I have given it to you upon the altar to make an atonement for your souls: for it [is] the blood [that] maketh an atonement for the soul.