The windpipe is the trachea
<span>It is used to develop the
tree of life and understand relationship between organisms. This study enables scientists comprehend the morphology and behaviour of organism. Its study is also
significant in medicine in understanding the evolution of diseases and hence important
in drug development. </span>
I believe the correct answer is:
C. Density-independent factor
Humans have invented things like clothing, houses, and heating systems to make lands with harsh climates more comfortable or livable. Human had to come up ways in order to be in a position to survive and live in lands with harsh climates such as cold weather, the invented, heating and heating system to always keep them warm.