Almost the entire system of an embryo is made of cartilage,
whereas that of an adult is mostly made of bones.
An embryo is a
multicellular diploid eukaryote in an early stage of embryogenesis, or
development. In general, in organisms that reproduce sexually, an embryo develops from a zygote, the single cell
resulting from the fertilization of the female egg cell by the male sperm cell.
Biologically, an adult is a human being or other organism that has
reached sexual maturity.
The correct answer between all
the choices given is the first choice or letter A. I am hoping that this answer
has satisfied your query and it will be able to help you in your endeavor, and
if you would like, feel free to ask another question.
