Describe the function of the cell parts of cell membrane

What came first egg or chicken? and is tomato a vegetable or a fruit?

How can antibodies "remember" a particular bacterial invader or "antigen" on that invader?

The carbon cycle is best defined as a process in which a. carbon changes from inorganic forms to organic forms and back b. carbon is changed into other elements such as oxygen or nitrogen c. carbon is continually created from the sun’s energy by plants d. carbon is consumed and regenerated from other elements such as oxygen and nitrogen