In frogs, yolks are plugged into the bottom of the blastopore, which develops into the anus. How about in sea urchins? I know in sea urchins the blastopore will become an anus but is there also a yolk plug, or does the bottom of the archentron simply develop into the anus?
Embryonic development:
The transformation of a fertilized egg into an embryo and then an adult organism is known as embryonic development. In most animals, including humans, embryonic development encompasses numerous phases, starting with fertilization and ending with birth or hatching. The initial stage of embryonic development is cleavage, during which the fertilized egg undergoes many rounds of cell division, resulting in a ball of cells called a blastula. The blastula then undergoes gastrulation, during which cells migrate and arrange into discrete tissue layers, generating a structure called a gastrula. Later, the germ layers give rise to numerous components of the body, including organs, bones, and muscles. This process is called organogenesis. During organogenesis, cells differentiate into certain cell types and begin to form rudimentary organs. Ultimately, the embryo undergoes maturation and growth, finally becoming a fully developed organism
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