When marine animals die, their shells decay into limestone. When the limestone is exposed, is released. This is a process known as .

Consider the last statement in the prompt: "people take such environmental factors into account in their choices when deciding where to live." do all people have a choice as to where they live? what factor plays a key role in this decision and may therefore play a large role in determining quality of life?

Which was most likely an effect on society that resulted from improvements in blood handling during world war i and world war ii?

Which of the following explains why a tree is often used as a model to represent the principle of common descent