Question

which of the following correctly identifies the levels of organization in biological systems from smallest to largest?
○a. cell - tissue - organ - organ system - organism

• population - community - ecosystem - biome - biosphere

○b. ecosystem - biosphere - biome - population - community

• organism - organ system - organ - tissue - cell

○c. biosphere - biome - ecosystem - community - population

• organism - organ system - organ - tissue - cell

○d. cell - organ - tissue - organ system - organism

• population - community - biome - ecosystem - biosphere

Explanation:

In biological systems, the correct order from smallest to largest is as follows:

• Cell: The basic unit of life.
• Tissue: A group of similar cells working together.
• Organ: Composed of different tissues performing a specific function.
• Organ system: Multiple organs working together.
• Organism: A single living being.
• Population: A group of the same species in a specific area.
• Community: Different populations living together.
• Ecosystem: Communities interacting with their environment.
• Biome: A large area with similar climate and organisms.
• Biosphere: All life on Earth and its interactions.

Option A follows this order. Option B and C start from larger units and go to smaller ones. Option D has an incorrect order between organ and tissue (tissue should come before organ as organs are made of tissues).

Answer:

A. cell → tissue → organ → organ system → organism → population → community → ecosystem → biome → biosphere