Final answer:
Anglo-Saxon poetry was composed of two half lines separated by a caesura, which is a pause or break in the middle of a line of poetry, often marked by punctuation.
Step-by-step explanation:
Anglo-Saxon poetry was composed of two half lines separated by a caesura. A caesura is a pause or break in the middle of a line of poetry, often marked by punctuation. It helps to emphasize certain words or ideas within the poem. For example, in the excerpt 'Morning Run', the caesura is represented by the line break after 'A rabbit hops across my trail':
A rabbit hops across my trail
A bouncy tail