During development, which portion of the brain-the grey or the white matter-enlarges more rapidly?

Explanation

**Step-by-Step Solution:**

1. **Understanding Brain Structure**: The brain is composed of two main types of tissue: grey matter and white matter. Grey matter consists mainly of neuronal cell bodies, while white matter is made up of myelinated axons.

2. **Identifying the Parts**: The cerebrum is the largest part of the brain, and it is divided into an outer layer (grey matter) and an inner layer (white matter). The outer layer appears grey due to the high concentration of neuronal cell bodies.

3. **Growth During Development**: During brain development, the grey matter enlarges more rapidly than the white matter. This is due to the increase in the number of neuronal cell bodies and the formation of synapses.

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