Dolphins are able to sleep without drowning because they have gills, like fish do. have a special opening that allows air in but not water. sleep on just one side of their brain at a time. inflate their bodies before sleep, which maintains them floating upright so they can breathe without taking in any water.

They sleep on just one side of their brain at a time

Explanation:

Dolphins are different from fishes that can breathe underwater.

It is necessary for them to get to the surface of the water at intervals to breathe air.

While sleeping, dolphins allows one hemisphere of their brains fall asleep while the other half is fully conscious. This means that If the left brain is sleeping, the right eye stays open and if the right brain is sleeping, the left eye stays open.

This happens so they always know when it's time to surface and breathe and when to escape when there is trouble.

sleep on just one side of their brain at a time

Explanation: While sleeping, the dolphin shuts down only half of its brain together with the opposite eye while the other half of the brain stays awake at a minimum level of alertness. It uses its attentive side to watch for predators or obstacles. The dolphin also reverses this process to rest the active side of the brain and awake the rested half.

im gonna compare the cells to jobs in factory. give brainliest

job in the factory //       cell organelle   //  

shipping/receiving

department                 plasma membrane    

chief executive officer// nucleus

factory floor // cytoplasm

assembly line// endoplasmic reticulum

workers in the assembly line //ribosomes

finishing/packaging department //golgi apparatus

maintenance crew //lysosomes

support beams (walls, ceilings, floors) //cytoskeleton

power plant //mitochondria/chloroplasts

here's what each part of the cell does:

plasma membrane :

regulates what enters and leaves the cell; where cell makes contact with the external environment

nucleus :

controls all cell activity; determines what proteins will be made

cytoplasm :

contains the organelles; site of most cell activity

endoplasmic reticulum:

where ribosomes do their work

ribosomes :

build the proteins

golgi apparatus :

prepares proteins for use or export

lysosomes :

responsible for breaking down and absorbing materials taken in by the cell

cytoskeleton :

maintains cell shape

mitochondria/chloroplasts :

transforms one form of energy into another