Animals cells are found inside the animals body. We have no exact place where it is found ;)
You would add H+ ions if you added an acid. Thus lowering the pH.
All of these components are reservoirs of carbon. The cycle is usually discussed as four main reservoirs of carbon interconnected by pathways of exchange. The reservoirs are the atmosphere, terrestrial biosphere (usually includes freshwater systems), oceans, and sediments (includes fossil fuels).
Professionals that study and make predictions about human population are called demographers.
6. a, 7. c, 8. b , 9. e , 10. d , 11. e, 12.c
