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Did bees (a type of insect) exist on Earth as early as 200 million years ago? Such a theory is supported by the discovery of very old fossil structures that resemble bee nests. The structures have been found inside 200- million-year-old fossilized trees in the state of Arizona in the southwestern United States. However, many skeptics doubt that the structures were created by bees. The skeptics support their view with several arguments.

No Fossils of Actual Bees

First, no fossil remains of actual bees have ever been found that date to 200 million years ago. The earliest preserved body of a bee is 100 million years old—only half as old as the fossilized structures discovered in Arizona.

Absence of Flowering Plants

A second reason to doubt that bees existed 200 million years ago is the absence of flowering plants in that period. Today’s bees feed almost exclusively on the flowers of flowering plants; in fact, bees and flowering plants have evolved a close, mutually dependent biological relationship. Flowering plants, however, first appeared on Earth 125 million years ago. Given the bees’ close association with flowering plants, it is unlikely bees could have existed before that time.

Structures Lack Some Details

Third, while the fossilized structures found in Arizona are somewhat similar to nest chambers made by modern bees, they lack some of the finer details of bees’ nests. For example, chambers of modern bee nests are closed by caps that have a spiral pattern, but the fossilized chambers lack such caps. That suggests the fossilized structures were made by other insects, such as wood-boring beetles.

生词与表达整理

  • Resemble v. 类似,像
  • fossilized adj. 石化的
  • skeptic n. 疑论者,怀疑主义者
  • exclusively adv. 唯一地;专有的
  • feed on 以…为食
  • evolve v. 发展,进化;使逐步形成
  • mutually dependent 相互依赖的
    mutually independent 互相独立的
  • biological adj. 生物的;生物学的
  • Given… 考虑到。。。
  • somewhat adv. 有点;多少;稍微
  • be similar to 与…相似
  • chamber n. 室,膛;房间 
  • finer adj. 出色的,好的
  • spiral adj. 螺旋形的;盘旋的
  • wood-boring n. 钻木头的,吃木头的

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