Afriend wants to show how energy moves in ecosystems . which model would you recommend ? explain .

He should use a food chain model.

Explanation:

A food chain is defined as a linear sequence of the transfer of matter and energy in an ecosystem, in which it is possible to observe a sequence of organisms serving as food for others. For this reason, this would be an ideal model for someone who wants to show how energy moves in ecosystems. This transfer always starts with a producer and ends with a decomposer, this transfer being unidirectional.

"griffith's experiment discovering the "transforming principle" in pneumococcus bacteria. griffith's experiment, reported in 1928 by frederick griffith, was the first experiment suggesting that bacteria are capable of transferring genetic information through a process known as transformation." - griffith's experiment.

the answer to your question is:

c. complementary base-pairing