Answer :
A biologist discovers an alga that is marine, multicellular, and lives at a depth reached only by blue light. This alga is most likely a type of red algae.
What is red algae?
Red algae, often known as Rhodophyta (from the Greek words v (rhódon) "rose" and phutón "plant"), are one of the oldest subgroups of eukaryotic algae. Additionally, the Rhodophyta is one of the largest phyla of algae, with over 7,000 species now recognized and continuous taxonomic revisions. The Florideophyceae (class) contains 6,793 species, the bulk of which are multicellular marine algae, including numerous well-known seaweeds. Red algae are prevalent in coastal environments but are scarce in freshwater environments.
Freshwater ecosystems contain 5% of red algae species, with warmer regions having higher amounts. There are no terrestrial species, with the exception of two species of asexual Cyanidiophyceae species that live in coastal caves. This lack of terrestrial species may be the result of an evolutionary bottleneck in which the last common ancestor lost about 25% of its core genes and most of its evolutionary plasticity.
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