Question

less than __ percent of all __ survive beyond the first 2 weeks after fertilization. 10; embryos 50; fetuses 50; zygotes 10; zygotes

Explanation:

In human reproduction, a zygote is the initial cell formed when a sperm and egg fuse. It is estimated that less than 10 percent of all zygotes survive beyond the first 2 weeks after fertilization due to various biological factors such as chromosomal abnormalities or failure to implant properly. Embryos are a later - stage development after the zygote stage, and fetuses are an even later stage.

Answer:

D. 10; zygotes