Answer:
The surviving roached were naturally resistant to the pesticide, and that resistance was inherited by their offspring.
Matter and electricity. i hope this answer has come to your pleasing
Since the small population is, well, smaller, it's clear enough to see that the genetic variation among that population won't be as prevalent as it will in the larger population. The larger population simply has more genes to choose from, of course.
the intellectual and practical activity encompassing the systematic study of the structure and behavior of the physical and natural world through observation and experiment.
