What are the characteristics of a food chain?
A: It is made up of 3 to 5 links.
B: It begins with a green plant, belonging to the producer of ecosystem.
C: Other links are usually predatory animals, belonging to the consumers of ecosystem
D: The carrot, the corn and the trees are usually producers.
A: It is made up of 3 to 5 links.
B: It begins with a green plant, belonging to the producer of ecosystem.
C: Other links are usually predatory animals, belonging to the consumers of ecosystem
D: The carrot, the corn and the trees are usually producers.
举一反三
- It is important to study polar bears to assess the health of the ecosystem on the Arctic, because（） A: they are on the edge of extinction. B: they are on the top of the ecosystem. C: the food chain on the Arctic depends on them. D: there are no other big animals on the Arctic.
- The following statement,whichis true() A: The ecosystem consists of animals, plants and microorganisms B: The ecosystem is composed of autotrophs, heterotrophs and syntrophs C: Theecosystems consist of plants, herbivores, carnivores, and scavengers D: Theecosystems consist of producers, consumers, decomposers, and abiotic environments
- The<br/>biological chain in the agricultural ecosystem is generally composed<br/>of more than ten links.( )
- What links the decisions of consumers and firms in a market?
- This small village is made up of 200 families ______ five nationalities. A: belonged B: belonged to C: belonging D: belonging to