What happens when the tide comes and the bladder wrack gets covered by water?

When the tide comes in and covers bladder wrack, the algae are submerged in seawater, allowing them to photosynthesize and absorb nutrients from the water. This underwater environment provides the necessary conditions for growth and reproduction. The water also helps protect bladder wrack from desiccation and extreme temperatures, promoting its overall health and resilience in the marine ecosystem.