Final answer:
The levels of organization in biological systems, progressing from the smallest to most encompassing, are: hydrogen atom, water molecule, skin cell, liver, elephant, wolf pack, tropical rainforest, and planet Earth.
Step-by-step explanation:
Levels of Organization in Biology
To understand the complexity of the biological world, it is useful to organize different biological entities by their level of complexity, from the smallest to the most encompassing. Here we list the given items according to this biological hierarchy:
- Hydrogen atom - It's the most fundamental unit of matter in this list, as it's a component of molecules.
- Water molecule - A group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.
- Skin cell - Cells are the basic unit of structure and function in living organisms.
- Liver - An organ made up of tissues that perform a specific function or group of functions.
- Elephant - An organism, in this case, a multicellular being that can perform functions necessary for life.
- Wolf pack - A population or group of organisms of one species living and interacting in the same area.
- Tropical rainforest - An ecosystem, which is a community of living organisms in conjunction with the nonliving components of their environment, interacting as a system.
- Planet Earth - At the highest level, representing a part of the biosphere which is the global ecological system integrating all living beings and their relationships.
Each level of this hierarchy shows an increase in complexity and interaction.