Haematococcus pluvialis is a freshwater species of Chlorophyta from the family Haematococcaceae. This species is well known for its high content of the strong antioxidant astaxanthin which is important in aquaculture and cosmetics. The high amount of astaxanthin is present in the resting cells which are produced and rapidly accumulated when the environmental conditions become unfavorable for normal cell growth. Given a list of categories: company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, what category does the paragraph belong to?
Plant