The function of nutrition comprises all the processes involved in obtaining substances from the environment and transforming them into substances of our own or decomposing them to obtain energy. 
In 1962, the writer and marine biologist Rachel Carson published The Silent Spring, an investigation into the widespread use of pesticides, in which she denounced that the poisons used were accumulating in the food chain, with enormous risks to human health and terrible effects on flora and fauna.

QUESTIONS: 
In the following activity we will work on the function of nutrition. 
a) Explain what the two types of nutrition consist of and indicate the groups of living beings that present each one of them. 
b) Indicate if the following living beings are autotrophic or heterotrophic: snail, oak, robin, seaweed, gecko, magnolia, mushroom and oleander. 
c) Why is it said that autotrophic and heterotrophic organisms depend on each other? 
d) The image shows us how some living beings feed from others, a food chain, for example, in a cultivated field. As Rachel Carson says in her book, the pesticides we use accumulate along this chain. Why do you think she titled it "Silent Spring"?