This document discusses the roles of producers and consumers in ecosystems. Producers such as plants and algae are able to make their own food through photosynthesis. Consumers obtain energy by consuming other organisms and are divided into primary, secondary, and tertiary consumers depending on what they eat. Consumers are further classified as predators that hunt living prey, scavengers that eat dead bodies, or parasites that feed on living hosts without killing them.

1. Nutrition in ecosystems.
By Violeta and David

2. Producers
• Plants are producers because
they make their own food.
Algae are also producers.

3. Consumers
• Animals are consumers
bechase they hunt other
living things.
• First consumers are animals
that take energy from plants.
• Secondary consumers are
animals that eat
herbivorous(first consumers).
• Tertiary consumers are
animals that eat secondary
consumers.

4. Consumers
• Predators are animals that eat
other animals.
• Scavengers eat dead bodies.
• Parasites eat other living
things without killing them.