Answer:
Respiration...................
That was correct. it was letter choice b
Answer:
They protect the body from infectious agents.
And
They signal the immune system to destroy pathogens.
Explanation:
I HOPE THIS HELPS
Answer:
Body systems are used throughout your body to help you move and to live like the heart for example.
Answer:
The cell theory developed most quickly due to the invention of the microscope. Robert Hooke was the first scientist who saw cells in cork. After this discovery, a wide numbered of researches were made and cell theory was developed. The basic cell theory explained that how every living thing was made up of cells. After this, a lot of additions have been made in the cell theory and today the cell theory is known to have five basic postulates.
