Answer: The correct answer is d. Organism, system, organ, tissue, cellular, chemical.
Step-by-step explanation:
This answer correctly lists the levels of organization in decreasing order of complexity. Let's break it down step-by-step:
1. Organism: This is the highest level of organization and refers to a complete living thing, such as a human or a plant.
2. System: A system is a group of organs working together to perform a specific function. Examples include the circulatory system or the respiratory system.
3. Organ: An organ is a structure composed of different tissues that work together to perform a specific function. Examples include the heart, lungs, or brain.
4. Tissue: Tissue is a group of similar cells that work together to perform a specific function. Examples include muscle tissue or nerve tissue.
5. Cellular: This level refers to individual cells, which are the basic building blocks of life. Cells perform various functions and make up tissues and organs.
6. Chemical: This is the lowest level of organization and refers to the molecules and atoms that make up cells and other structures in the body. Examples include proteins, DNA, or ions.
So, the correct order of the levels of organization, from highest to lowest complexity, is organism, system, organ, tissue, cellular, and chemical.