Survival the fittest, that to me applies to all living beings
from insects to human being.
Talk about struggle, when we first came to this country, 16-18 hours day - full-time work, full-time college, 2-3 hours on the freeway between home/office/school/home. Out at 7am in at 10pm, day-in day-out. I did not know how I did it, but I did it. Never thought about much. May be that was a good thing. Otherwise I probably would have given up long ago.