Answer:
The muscular system helps push air in and out of the respiratory system. The respiratory system has the lungs to deliver air to the muscles
Explanation:
Endocasts of Homo erectus (left) and Homo sapiens (right) illustrate rapid increase in brain size. As early humans faced new environmental challenges and evolved bigger bodies, they evolved larger and more complex brains. Large, complex brains can process and store a lot of information.
C. they are always heritable. b. they are inly heritable in gametes
C. Mammary gland. Hope this helps!
