Ferns are green plants and produce food through photosynthesis like all other green plants; they vary from other the majority of other plants through their method of reproduction (spores and not seed).
Ferns have a root system and also absorb disolved minerals, oxygen and water from the soil
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Birds live on trees because if birds are on the ground a predator will come and eat the bird.
It has chloroplasts which contain chlorophyll that traps sunlight, to photosynthesis and make food when water and carbon dioxide are present.
The tiny dots found on the underside of the bird's nest fern are the fern's spores. These spores are a part of the fern's reproductive process and will eventually mature into new fern plants.
The nest was built by birds.
Te specific study of the birds nest is calle "ornithology".
Birds mate after and before making a nest
A birdhouse.