Cephalochordata is the subphylum that retains all chordate characteristics, even in the adult forms.
Answer:
b) adaptation
Explanation:
the organism is able to adapt to its environment and thrive
I think it's D. Venus and Mars have different chemical compositions from Earth.
you should read this
https://www.forbes.com/sites/briankoberlein/2016/08/15/why-is-earths-atmosphere-so-different-from-other-planets/#1597ea370223
