Answer:
Select
a and c
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How much carbon dioxide would a car release in one day?
The answer is speciation by geographic isolation. When the population of a species gets separated due to reasons such as continental drift, mountains, canyons, etc. then each separated group of population may survive and adapt to their respective environment leading to speciation. These barriers do not allow the evolving populations to interbreed initially and over time when they evolve into different species they become completely reproductively isolated.
So dark linen thread structure is chromosome that we see. And and by molecule heritage that we contain.