人们在针叶树和某些其它树木的硬化树脂中发现了昆虫，甚至发现了小型无脊椎动物。
Insects and even small invertebrates have been found preserved in the hardened resins of conifers and certain other trees.
积热也是测定落叶树和果树芽分生组织活动的有效手段。
Heat sum is. a useful measure of the onset of meris. ematic activity buds in deciduous and fruit trees.
在这之后出现了鱼类，爬行类，哺乳动物，蕨类，针叶树和开花的植物。
They were followed by the emergence of fish, reptiles, mammals, ferns, conifers and flowering plants.
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