Crown-of-thorns starfish are predators that can devastate coral reefs if their population is left unchecked
Sanders plans to address supporters during a livestream later, a statement said.
The US senator from Vermont, a democratic socialist whose progressive agenda pulled the party sharply to the left, shot to an early lead in the Democratic race but faded quickly after losing South Carolina in late February as moderate Democrats consolidated their support behind Biden's campaign.
The departure of Sanders, the last remaining rival to Biden, sets up a battle between the 77-year-old former vice president and Trump, 73, who is seeking a second four-year term in office.
Sanders' decision to step aside came with the country in the grip of a coronavirus outbreak that upended the nominating elections schedule, with some primaries postponed and others up in the air. Sanders had been his party's front-runner just a month ago.
Sanders, who also mounted an unexpectedly strong challenge in 2016 to eventual Democratic nominee Hillary Clinton, had been under pressure to halt his campaign after Biden won resounding victories in primary contests on March 17 in Florida, Arizona and Illinois.
Crown-of-thorns starfish are predators that can devastate coral reefs if their population is left unchecked
After being named World Sportsman of the Year at the Laureus Awards, Djokovic said he was aiming for the Italian Open
The exhibition set to transform the regional flooring industry
The American reinforces his dominant position as No 1 in the Official World Golf Ranking for a fourth victory in five outings
For Inzaghi, this was the first Serie A title of his managerial career and sixth trophy with Inter
Many residents of the emirate's Al Suyoh community were relocated to hotels after a raging wadi swept across their neighbourhood during the records rains last week
The DP World Tour reaches the midway point of its Asian Swing when it returns to action with the ISPS HANDA Championship in Japan
The exhibition will focus on key trends such as AI, cloud, and operational technology, as well as bridging the skills gap