DENDROLOGY

Detailed explanation-1: -Respiration is the process by which living things obtain energy from food. Oxygen is required to convert the food that we eat into energy. This is acquired through breathing which is then used to obtain energy from the nutrients obtained from our food.

Detailed explanation-2: -Heterotrophs are known as consumers because they consume producers or other consumers. Dogs, birds, fish, and humans are all examples of heterotrophs. Heterotrophs occupy the second and third levels in a food chain, a sequence of organisms that provide energy and nutrients for other organisms.