bacteria may, like a fetus, have a heartbeat, but a fetus actually develops into a breathing, talking, living person. There's a HUGE difference between a human and a plant. Humans live, make descisions, interact with others, and do so much more than an actual plant. Plants have their uses a well, but they are in nonways as amazing or complex as a human life. So yes, fetuses and plants have heartbeats, but human lives have so much more value and impact than plant lives.