What often results in a woodland without frequent fires? a. a predominance of pine trees b. a predominance of fast-growing trees c. barren land d. an understory of oak trees

Option D, An understory of oak trees

Explanation:

The State and transition models of the oak woodlands are depended on the fire cycle. It is also claimed by researchers that forest fire (disturbances) are important  determinants of the patchy distribution of these vegetation types in woodland.

A woodland with no or without frequent fires has an understory of oak trees comprising of native annual and perennial  trees, grasses and forbs. Most of these native tree , grass, forbs and shrub species vary in amount due to  inadequate fire frequency.

Hence, option D is correct

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answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.