Scientists studied the development of a multicellular organism. The table shows observations from a normal specimen and from specimen X.

Group of cells	Normal specimen	Specimen X
R	The cells become similar in structure and contract together.	The cells remain like the early unspecialised cells.
S	The cells become similar in structure and make and release substances.	The cells become similar in structure and make and release substances.

In this organism, movement is produced only when group R contracts.

In a normal specimen, groups R and S form structure T. The groups work together so that structure T can carry out one function.

Suggest how the failure of group R to differentiate would affect the movement of specimen X. Explain your answer.

Suggest which level of organisation structure T represents. Explain your answer.

Scientists studied the development of a multicellular organism. The table shows observations from a normal specimen and from specimen X.

Group of cells	Normal specimen	Specimen X
R	The cells become similar in structure and contract together.	The cells remain like the early unspecialised cells.
S	The cells become similar in structure and make and release substances.	The cells become similar in structure and make and release substances.

In this organism, movement is produced only when group R contracts.

In a normal specimen, groups R and S form structure T. The groups work together so that structure T can carry out one function.

Suggest how the failure of group R to differentiate would affect the movement of specimen X. Explain your answer.

Suggest which level of organisation structure T represents. Explain your answer.

2.1 Principles of organisation

2.1 Principles of organisation Questions