This question is perfectly suited to be answered by a counter-question. However, since answers.com do not like questions being answered with questions, I'll rephrase the question as a simple statement:
There's no particular reason that they should have been wiped out. All forms of life face certain challenges on their long evolutionary paths; some are overcome, others cause extinction. The ladybug is no more or less likely to face such challenges than any other form of life.
This process is called natural selection. It is the mechanism by which traits that provide a survival or reproductive advantage to an organism become more common in a population over time.
Natural selection can only work on genetic variation that already exists. So mutation comes first, then natural selection.
It hasn't. Natural selection is a key part of the ecosystem itself.
Natural selection is the mechanism primarily responsible for the development of today's biodiversity.
No, natural selection works on that genetic variation presented to it.
Its NaTuRaL sElEcTiOn if you didn't know.
Adaptation does not allow for natural selection: natural selection causes adaptation.
The prefix of natural selection is "natural" and the suffix is "-tion".
Genetic variation in itself does not 'support' natural selection: it is what natural selection acts upon.
Natural Selection
Natural selection.
Natural selection
That selection was natural.
No, natural selection is the mechanism that drivesevolution.
Natural selection is what causes adaptation.
natural selection
Natural Selection - group - was created in 1989.