Does everyone agree with this Guy?
Nope, I quite firmly disagree on some points.
consol said:
in order to survive in a changing world, some offspring are slightly different from their parents,
No.
(1) ALL sexually derived offspring are different from BOTH their parents except in the highly unlikely case that the parents have at least one allele of each of their genes in common AND the offspring happens to get the exact same complement of alleles that are found in one of its parents. Since crossing over and chromosome segregation are random, the probability of that is very small.
Asexual organisms will differ from their parent if a mutation has occurred in the cell they developed from.
(2) Very importantly, offspring aren't different from their parents "in order to" do something, they are different
because recombination and mutation (more or less random processes) exist. However, this does lead to heritable variation which is a necessary condition for evolution to occur.
consol said:
things die so that others may live
In a sense this may be true in colonial/social organisms. But only in a sense of 'if you aren't willing to die for your relatives, perhaps none of you will survive. If you are willing, at least one of you may live and pass on the genes that made you willing to sacrifice yourself'. Genetic relatedness is a very important factor in the evolution of altruism.
consol said:
If a thing can survive, it breeds
I'd modify this to:
If a thing breeds, it surely was good enough to survive.
I went to a week-long plant science summer school in July where one of the stars of the course was
Arabidopsis thaliana, the classic model organism of plant genetics & development. I saw several mutants which were perfectly viable - but they had defective reproductive parts, or lacked them altogether (ironically, the only
Arabidopsis specimen I could perhaps call beautiful, one with several whorls of snow-white petals, was one of them

).