Levels of Organization

Question 1

Atoms

Answer 1

Basic units of matter, such as carbon, hydrogen, and oxygen

Question 2

Molecules

Answer 2

Combination of atoms, such as water and DNA

Question 3

Organelles

Answer 3

Specialized structures within cells, such as the nucleus and mitochondria

Question 4

Cells

Answer 4

The fundamental units of life (structure and function), example: muscle cells, nerve cells…

Question 5

Tissues

Answer 5

Groups of similar cells performing a specific function, ex: epithelial tissue

Question 6

Organ Systems

Answer 6

Groups of organs that work together to perform complex functions, e.g. the digestive system

Question 7

Organs

Answer 7

Structures composed of different tissues working together, e.g. the heart

Question 8

Organisms

Answer 8

Individual living entities that can function independently, e.g. a human or a tree

Question 9

Populations

Answer 9

Groups of organisms of the same species living in a specific area

Question 10

Communities

Answer 10

All the populations of different species living and interacting in an area

Question 11

Ecosystems

Answer 11

Communities of organisms interacting with their physical environment

Question 12

Biosphere

Answer 12

The global sum of all ecosystems, representing the zones of life on Earth

Question 13

List levels of organization of Atom - Ecosystems, from smallest to biggest

Answer 13

Atoms
Molecules
Organelles
Cells
Tissues
Organs
Organ Systems
Organisms
Populations
Communities
Ecosystems
Biosphere