Practice question · Put in order
Arrange these stages of early animal development in order.
- A fertilised egg, a single cell
- Organs begin to take shape
- A hollow ball of undifferentiated cells
- A functioning multicellular organism
- Distinct germ layers form
Hints
- Development proceeds from one cell to many, then to specialised types.
- Germ layers are established before any organ appears.
Show the answer
- A fertilised egg, a single cell
- A hollow ball of undifferentiated cells
- Distinct germ layers form
- Organs begin to take shape
- A functioning multicellular organism
Why
One cell divides into a hollow ball, germ layers are established, organs form from those layers, and the body becomes functional. The order is highly conserved, the same broad sequence runs across almost all animals.
Practise From Single Cells to Multicellular Bodies
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