a seed / a pit or stone in a fruit / a gamete (reproductive cell such as a spermatozoan or egg) / a lineage, bloodline / an origin, cause / the materials or ingredients from which something is made

to go extinct; to be annihilated; to be eliminated

extinction; annihilation; elimination

misgivings, unease, apprehension

have misgivings, be apprehensive, fear, be concerned, feel uneasy

a crested ibis, Nipponia nippon

a crested ibis, Nipponia nippon

one thing

seed / plant, sow / class, kind, variety / (taxonomy) species

a seed / a kind, type, sort, class, or category / (taxonomy) a species