Your answer would be B ,C is incorrect because then he would get different answer D does not matter it would be the same A it would take longer and it basically the same as the measuring tape but B that would get you better answers that are more accurate because then you would have backups in case you mess up one. Hope that helps
Answer:
A. the food web
Explanation:
Ecosystems have lots of different living organisms that interact with each other. The living organisms in an ecosystem can be divided into three categories: producers, consumers and decomposes. They are all important parts of an ecosystem. Producers are the green plants.
A) Virus.
Viruses force host cells to produce thousands of copies of the virus by attaching to the the host cell and transmitting its genetic material into it