Qualitative data is when you can see the ecosystems. the importance of biodiversity for all sustainable ecosystems is biodiversity boosts ecosystem productivity whether each species, no matter how small, all have an important role to play.
I believe rottening would be the answer. Rotting, dead plants and animal feaces make great fertilizers.
D. An encyclopedia. Encyclopedias are trusted and have reliable information. I feel like this shouldn't be posted in biology though
