Protostomes develop a mouth first and then an anus. This is the difference between protostomes and deuterostomes.
In protostome development, there is a spiral radical and indeterminate cleavage. The blastopore becomes the mouth and the coelom forms from the mesoderm.
In deuterostomes development, radial and indeterminate cleavage takes place. The blastopore is the new anus and the coelom forms from budding off the wall of the archenteron.
The largest source from what it says is industries
Living organisms are development on other living organisms to survive producers make their own food consumers gain energy from producers, and decomposers break down dead matter into essential nutrients that are then released by producers juicers gain energy from the Sun consumers gain energy from the producers and decomposers get energy from dead consumers and recycle it back to the producer all of the above