Nearly all autographs use a process called photosynthesis to create “food” (a nutrient called glucose) from sunlight, carbon dioxide, and water

parasitic worms (e.g. nematodes), cells harbouring pathogenic (disease-causing) viruses, a bean plant hosting mutualistic (helpful) nitrogen-fixing bacteria.

segmented flatworms that attach themselves to the insides of the intestines of animals such as cows, pigs, and humans.

animals that are killed and eaten by other animals

an animal that kills and eats other animals

living beings such as trees, plants, animals, insects and micro-organisms that are in constant interaction between themselves and that are affected by other physical (sun, temperature) or chemical (oxygen or nutrients)