Once fertilization creates the zygote, the next development stage is the embryoblast blastocyst inner cell mass morula

The next development stage after fertilization creates the zygote is the blastocyst. Here are the steps:

1. Fertilization: This is the process where an egg from the mother is fertilized by a sperm from the father to form a zygote.

2. Cleavage: After fertilization, the zygote begins to divide through a process called cleavage. This results in a cluster of cells.

3. Morula: The cluster of cells is called a morula. This stage occurs around 3-4 days after fertilization.

4. Blastocyst: The morula continues to divide and forms a hollow ball of cells called a blastocyst. This stage occurs around 5-6 days after fertilization. The blastocyst has an outer layer of cells, and an inner group of cells known as the inner cell mass.

5. Embryoblast: The inner cell mass of the blastocyst, also known as the embryoblast, will go on to form the embryo.

So, the correct answer to your question is the blastocyst.