1- Blastomeres are
increasingly smaller after each mitotic division
totipotent until the 24-cell stage
formed when fluid is secreted into the blastocyst cavity
formed by the morula outer cell layer

2- Formed when fluid is secreted within the morula
blastula
blastomere
blastocyst
tropoblast

3- Outer cell mass of the blastocysts
hypoblast
embryoblast
tropoblast
cytotropoblast

4- Implantation of the blastocyst occurs
within the posterior inferior wall of the uterus by day 6 after fertilization
within the posterior superior wall of the uterus by day 7 after fertilization
within the lateral inferior wall of the uterus by day 8 after fertilization
within the lateral superior wall of the uterus by day 9 after fertilization

5- A small cleft divides the early epiblast into two layers
embryonic epiblast and amniotic lining
cytotropoblast and syntiotrophoblast
embryoblast and tropoblast
yolk sac and hypoblast

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Answers:

1- Blastomeres are
Answer: increasingly smaller after each mitotic division

2- Formed when fluid is secreted within the morula
Answer: blastocyst

3- Outer cell mass of the blastocysts
Answer: tropoblast

4- Implantation of the blastocyst occurs
Answer: within the posterior superior wall of the uterus by day 7 after fertilization

5- A small cleft divides the early epiblast into two layers
Answer: embryonic epiblast and amniotic lining