Improved nutrition, medical treatment, and sanitation all account for the dramatic increase in in the twentieth century. a. the life expectancy crossover b. functional age c. active living age d. average life expectancy

Consider the model of the oxygen cycle on earth. the majority of earth's oxygen reservoirs are found in the a) atmosphere. b) biosphere. c) hydrosphere. d) lithosphere.

What is a limitation of using a chemical formula, such as c6h1206, to represent a compound? the chemical formula does not show the types of elements that make up the compound. the chemical formula does not show how the atoms are connected to one another the chemical formula does not show the number of atoms of each element in a molecule. the chemical formula does not show the chemical symbols of the elements in the compound

Wich level of organization includes all the other levels or organizations