What is meaning of tertiary tillage?

Why do I constantly hear a pulse in my ears? Why is it that NaCl dissolves so well in water but many other ionic compounds do not? What body part does stingrays use for protection? Can you eat animals? How can you tell a female and a male Chinese water dragon apart? What annelid group of septa between coelomic components lost? Does amphibian breathes through its lungs and lays its eggs on land and they has scaly and dry skin texture? How can I effectively scare away stray dogs? What is an interesting fact about the miwok? What is the average lifespan of a Cocker Spaniel? Is What an animal uses for food part of its niche? An autotroph is an organism that? Is hissing always a sign of aggression? What are the possible causes of cat stool mucus and how can it be treated effectively? Is it mandatory for parrots to have ankle bands? Can formula spoil in a babys stomach when its hot outside? How long can a grebe stay underwater? Why amphibians potential lead organisms for habitat protection campaign? Why is my cat digging on my bed? Why a person might need to adapt to his environment to survive?