As you can see in the pedigree presented below, the allele that enables the adaptation for living in high altitudes is recessive, meaning that two copies of this allele are necessary in order for the individual to possess this trait.
Answer:
The competitive exclusion principle says that two species can't coexist if they occupy exactly the same niche (competing for identical resources). Two species whose niches overlap may evolve by natural selection to have more distinct niches, resulting in resource partitioning.
Explanation:
So sorry not sure I would say part A but not a 100% sure
It has known to cause sicknesses such as lung cancer. We have found out way more the long term causes of smoking now, than we did in 1960.