Hey there
the answer is
A.the ability of your heart and lungs to work during prolonged exercise
thank you
SAVAGELEGEND72
The answer is B I believe!
The reproductive system is a group of sex organs that work together for the purpose of sexual reproduction. Hope this helped!
The first species that colonizes new of undistributed land is called as pioneer species, or simply pioneers. If you check the meaning of pioneer, it's a type of person or entity that became the first to explore or exploit a certain something. In this case, they were the first species who explores the lands to create a society.