A. producer B. primary consumer C. secondary consumer D. tertiary consumer 相关知识点: 试题来源: 解析 B。在食物链中,吃植物的生物被称为初级消费者。A 选项生产者能自己制造有机物;C 选项次级消费者以初级消费者为食;D 选项三级消费者以次级消费者为食。反馈 收藏 ...
Only a few countries in the world do not have a large wild animal that eats meat. The UK is one of them. Some people would like to change things, however! Some organizations and writers say that Britain needs to become more natural again. They suggest bringing back the trees and animals...
As with Bt crops, it is possible that HD-RNAi pest-resistant crops could have harmful effects on non-target organisms exposed to living plants, plant parts or debris (Figure 1). For example, research has shown that insect pests consuming small RNA molecules could be killed (or stunted) by...
squatting; and the worsening physical symptoms were a spree at Bonwit’s compared to time’s black assurances that the symptoms were merely hints, signposts pointing up at a larger, far more dire set of Withdrawal phenomena that hung just overhead by a string...