Contour plowing. this helps with soil erosion and use full use of rainfall
Natural selection is a central concept of evolution. Natural selection is the process where organisms with favorable traits are more likely to reproduce. In doing so, they pass on these traits to the next generation. Over this time this process allows organisms to adapt to their environment.
There is no process pictured.....
The circulatory system and respiratory system are protected by your skin, muscles, and ribs.
