| nature(noun, environment, world, surroundings) |
| evolution(noun, progress, growth, expansion) |
| life(noun, nature, environment, endurance, existence) |
| process(noun, nature, system, procedure, course) |
| reproduction(noun, activity, nature, biology, selection) |
| survival(noun, life, endurance, existence, continuation) |
| theory(noun, knowledge, supposition, principles) |
| natural process(noun, expression, nature, action, process) |
| selection(noun, choice, preference, option) |
| actuality(noun, life, existence, lifetime, subsistence) |
| being(noun, life, existence, lifetime, subsistence) |
| durability(noun, life, endurance, continuation, survival) |
| endurance(noun, life, continuation, survival) |
| entity(noun, life, existence, lifetime, subsistence) |
| existence(noun, life, duration, lifetime, subsistence) |
| genetics(noun, nature, study, science) |
| hypothesis(noun, knowledge, theory, supposition, principles) |
| lifespan(noun, life, existence, duration, aliveness) |
| lifetime(noun, life, existence, subsistence) |
| longevity(noun, life, endurance, existence, continuation) |