Science X staff
August 20, 2021
Ctenophores, also known as comb jellies, are a group of over 200 living species of invertebrate animals with a transparent gelatinous body superficially resembling that of a jellyfish. There is much interest in ctenophore evolution in recent years as their controversial phylogenetic position in the animal tree of life has prompted conflicting hypotheses. While some studies suggest they might represent the earliest branching animals, others suggest a more traditional position as close relatives of jellyfish.
August 17, 2021
The Cambrian period, which occurred around 541-485 million years ago, is known for its explosive biological diversification. In warm oceans, the planet's earliest eukaryotes began to thrive and diversify. A major contributing factor to the acceleration of life and the development of early metazoans is thought to be an increasingly efficient food web, created largely by algae. These new photosynthetic creatures allowed for easier nutrient transfer between species than their more ancient equivalents, the cyanobacteria.