Examlex
Which kingdom contains nonphotosynthetic multicellular organisms that digest their food internally?
Blastocyst
An early stage embryo consisting of a sphere of cells surrounding a fluid-filled cavity and a cluster of cells inside known as the inner cell mass, which eventually develops into the fetus.
Fetus
A developing mammal or human from the end of the embryonic stage (usually from nine weeks after fertilization) to birth.
Blastocyst
A stage of embryonic development characterized by a fluid-filled structure formed about 5-6 days after fertilization, preceding implantation in the uterine wall.
Nutrient Exchange
The transfer of nutrients from the mother to the fetus during pregnancy, essential for fetal development.
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