Question

read this paragraph from a passage. however, not everyone is convinced that genetically modified foods are beneficial. opponents say that too little research has been done on the effects of gmos on humans and on the environment. they argue that gmos could be creating new poisons. they are also concerned about what might happen if genetically modified plants breed with wild plants. some farmers are concerned about the possibility of inadvertently crossbreeding gmo plants with non - gmo plants. for example, if the pollen from a gmo plant blows into their organic field, now that organic crop could become a gmo crop. the possibility also exists that all this interbreeding could lead to new strains of herbicide - resistant super - weeds. what is the topic sentence of this paragraph? opponents say that too little research has been done on the effects of gmos on humans and on the environment. however, not everyone is convinced that genetically modified foods are beneficial. the possibility also exists that all this interbreeding could lead to new strains of herbicide - resistant super - weeds. some farmers are concerned about the possibility of inadvertently crossbreeding gmo plants with non - gmo plants.

Explanation:

The topic sentence introduces the main idea of the paragraph. Here, the paragraph discusses the opponents' views on genetically modified foods. The first sentence "However, not everyone is convinced that genetically modified foods are beneficial" sets the stage for presenting the opponents' arguments (lack of research, creation of new poisons, cross - breeding concerns etc.). The other options are details supporting the main idea (opponents' views) presented in the first sentence.

Answer:

However, not everyone is convinced that genetically modified foods are beneficial.