Question

Foetus is made up of a single cell .​

Answer 1

Answer:

Each embryo starts development as a zygote, a single cell resulting from the fusion of gametes (i.e. fertilization of a female egg cell by a male sperm cell). ... A newly developing human is typically referred to as an embryo until the ninth week after conception, when it is then referred to as a fetus.

Answer 2

Featus is made up of a single cell

When the sperm fuses with an ovum ,the zygote is formed, which is single celled . these single cell then differentiate further and form the embryo , which is the first stage of embryonic development, therefore, a zygote is formed of a single cell , which then differentiates and forms an embryo