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any disease that is caused by a virus or a bacterium or any other micro-organism.
a graphical representation of the evolutionary relationship between taxonomic groups based on...
all the ecosystems on the Earth, all the species within these ecosystems and the genetic...
a thick layer inside the primary cell wall. It consists mainly of cellulose, hemicellulose and...
small, non-pigmented plastids that occur in roots and non-photosynthetic tissues of plants. They...
mass extinction event of 250 million years ago, in which about 90% of all species on Earth died...