Cells 5.L.1.1

Sue and Allie read about different kinds of organisms. They read about an organism with a respiratory system, digestive system, skeletal system, and muscular system. Which can Sue and Allie most likely conclude about this organism?

• The organism is unicellular.

• This organism is microscopic.

• The organism is multicellular.

• The organism does not have any cells.

An organism has several major body systems that work together to allow the organism to survive. Which best describes this organism?

• It is a single-celled organism.

• It is a multi-celled organism.

• It is a simple organism.

Which best describes humans?

• Humans are made up of many cells and all cells combined carry out a single life process.

• Humans are made up of many cells and all cells combined carry out life processes.

• Humans are made up of one single cell that carries out a single life process.

• Humans are made up of one single cell that carries out all life processes.

Which best describes a difference between single-celled organisms and multicellular organisms?

• Single-celled organisms are simple, while multicellular organisms are complex.

• Single-celled organisms have many functions, while multicellular organisms have one function.

• Single-celled organisms can live without water, while multicellular organisms cannot live without water.

• Single-celled organisms can only be found in one specific environment, while multicellular organisms can be found anywhere on Earth.

Which best explains why humans are multicellular organisms?

• Human cells are too small to function alone.

• Human cells join together to form one large cell.

• Humans need many cells to carry out life processes.

• Humans have many systems that perform the same function.