There are many fish and other large marine animals in the light zone becuse plankton (a main foodsource for many fish) is able to grow.
Well you can go on youtube and look up how to do it
Answer – Repetitive Transcranial Magnetic Stimulation (rTMS)
Repetitive transcranial magnetic stimulation (rTMS) is a type
of brain stimulation therapy used in the treatment of depression and anxiety;
it’s most especially used for the treatment of severe depression. During the
procedure, a magnetic field generator (coil) is placed near the head of the
person to deliver repeated pulses of magnetic energy.
Sponges are the simplest bilateral animal and do lack a body cavity. A sponge has two layers of tissue.
