What is the morula? And when does it develop?

Morula: a solid ball of cells resulting from division of a fertilized ovum, and from which a blastula is formed.

When is it formed: In humans, the blastocyst is formed approximately five days after fertilization. This stage is preceded by the morula. The morula is a solid ball of about 16 undifferentiated, spherical cells.

tbh i don't really know when it's formed, but i looked it up and that's what it gave me. i hope it helped :)

voluntary muscles are controlled by the cerebellum.

in the year 2850, humans successfully colonized mars. the martian modules that were constructed could hold only a small population of people. it is now a century later, and the population on mars has grown to 600 people. of the current mars population, 45 people express the recessive phenotype for phenylketon- uria (pku) syndrome (pp genotype).

explanation: