Nope.
Science can't define what we perceive "life" to be, in terms of "life" as it pertains to this conversation; it can only tell you the properties of what it is / how it functions, and it is your own ethical worldview which determines when it is "a life."
According to Science, plants are also living organism which have needs. When we harvest food, are we committing genocide against plants?
No, because our own international ethical worldview doesn't view plants as of anywhere near the same importance as human beings - something you'll find throughout every culture in history (including animist - vegetarian religions like Jainism).
As it pertains to humans, there's so many philosophical discussions of what makes one an "individual" or a "human being," that to suggest that this is something which can be objectively, without any bias, proven through visual study is something that you cannot do.
If you remove the legs of a human being, is it a human being? If you remove the arms, is it a human being? If you remove the heart and replace it with a machine, is it a human being? If you remove the brain but replace it with a machine, keeping the same consciousness, is it a human being? If you transfer the consciousness to a computer, is it a human being? If you replace the mind with an artificial intelligence but keep the human being the same in all organic functions, is it a human being?
If someone is so mentally insane that they act like a goat, are they a human being?
Any kind of answer to these questions is not an appeal to "objective science," but your own definition of what makes a human being a human.
But what makes something a life is irrelevant to my argument.
If you don't believe that a "zygote" is a life, your "subjective" view of declaring it "when it's a life" is irrelevant, because you are committing a positive action to prevent a full human being from existing, which, had you not committed, would exist.
According to the Merriam Webster dictionary, "to kill" is "to deprive of life", which is what abortion is.
Even if you had a vasectomy, a human being would not be prevented from existing, because over time, without any action, the sperm would remain a sperm, whereas a zygote would turn into a fully formed human being without any action.