You may know that, on average, individuals were shorter 400 years ago compared to today. The fact that modern-day humans are now taller is likely a reflection of:
A) environmental variation, as modern-day diets vary drastically from those of a few centuries ago.
B) genetic variation, as over time genes conferring increased height may have been selected for in humans.
C) neither environmental variation nor genetic variation; height is random in humans.
D) both environmental and genetic variation.
Correct Answer:
Verified
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