Which of the following is the correct order of organizations of structures in living things from simplest to most complex?
a. tissues, cells, organs, organ systems
b. cells, tissues, organ systems, organs
c. cells, tissues, organs, organ systems
d. organ systems, organs, tissues, cells which of the following is the correct order of organizations of structures in living things from simplest to most complex?
a. tissues, cells, organs, organ systems
b. cells, tissues, organ systems, organs
c. cells, tissues, organs, organ systems
d. organ systems, organs, tissues, cells

1.C. Cells, Tissues, Organs, Organ Systems

2.D. Organ Systems, Organs, Tissues, Cells

Explanation:

Cells are the smallest form in the living things organization of structures, then cells form tissues, and tissues form organs, and organs make up for organ systms, so in that order from simplest to most complex the order would be:

Cells-Tissues- organs- Organ systems

And backwards would be

Organ systems-Organs- Tissues- Cells

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the fossil record provides evidence of a common ancestor to many species.