Fully alive?!?!?!?
Seriously. Only a person completely devoid of any scientific understanding would deny that the baby/fetus, is composed of living cells. So, FACT: alive. Genetic analysis will show, those cells are distinct human cells, not part of the mother's genetic code. So, FACT: human. So killing the baby is ending human life.
And BTW, picking flowers, does in fact, KILL the flowers, albeit slowly.
Further point: your false equivalence strawman of mass murder is inapplicable since only humans can be "murdered"