Reproduction is the process by which organisms give rise to offspring.
Life continues because of reproduction.
Life continues because organisms give rise to offspring.
Why does life continue?

[a] to use resources
[b] organisms produce offspring.
[c] sub-units of species
[d] things don't die
[e] the Earth being tilted
[f] production of energy
[g] to keep going
[h] by keeping them warm