While tallness is evidently a hereditary characteristic , any individual 's actual height depends on the interaction between their .

虽然身高是一种明显的遗传特征，但是个体的实际身高则取决于基因和环境的相互作用。

I read some where that the ancient humans were very tall and we decrease in tallness as time passes !

我读的文章说古代的人类就是非常高的，随着时间的推移，我们在减低高度。