Answer:
up to 1/2. Between one-third and one-half of all fertilized eggs never fully implant. A pregnancy is considered to be established only after implantation is complete.
I believe that it is 2. LSD binds with serotonin receptors so 1 is out. LSD is actually both a stimulant and a depressant so 3 is our. Honestly I don’t really know what it means by perpetual changes because literally every drug will cause perpetual change.
