The answer would be <span>insulin-dependent diabetes mellitus.</span>
Your answer should be tissues.
"Natural selection<span> is the differential survival and reproduction of individuals due to differences in </span>phenotype<span>. It is a key mechanism of </span>evolution<span>, it is a change of </span>heritable traits<span> in a </span>population<span> over time"</span>
Answer: D. Weathering breaks down rock and other material
Explanation:
Because weathering/erosion cause rocks to break down into tiny sediments over time
It is important because the results would not be reliable since other variables you are not testing could have been in affect.
Hope this helps(;