Which of the following is true about the hierarchy or organization of life? (Check all that apply)
A. Changes at the lowest level can affect the more complex levels.
B. Cells make up tissues.
C. Cells are made up of macromolecules.
D. Tissues make up organs.
E. Starting at the most basic level is the atom.

What two fields of study provide the core information that is used to classify organisms?

Multicellular organisms use cell division, mitosis, for growth and the maintenance and repair of cells and tissues. single-celled organisms may use cell division as their method of reproduction. regardless of the reason for mitosis, the process ensures genetic continuity. what is the step in the cell cycle that ensure genetic continuity?

Common symptoms of an iron-defiency anemia include muscle weakness shortness of breath and lightheadedness why does iron deficiency causes these symptoms