In the process of embryonic development, which stage comes first?
a. gastrula
b. blastocyst
c. morula
d. blastocoel

Ans.

Embryogenesis or embryonic development is defined as a process that involves formation and development of a zygote into embryo. The fertilized egg or zygote undergoes mitotic divisions through cleavage and divides rapidly.

The first stage of embryonic development is known as morula that represents a 16 cells consisting solid ball-like structure. The morula later develops into blastula.

Thus, the correct answer is option C). 'morula.'

the correct answer: the index of refraction of the second medium is lower i tried this persons answer and it was wrong this person is lying

the relative standard reduction potential of the half-cell in which reduction occurs; more positive than the other half-cell. reduction is a chemical process in which electrons are added to an atom or an ion; it always occurs accompanied by oxidation of the reducing agent.