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Reptiles were the first group whose eggs cushioned the embryo in fluid and protected it with membranes and a shell. This prevents eggs from drying out and allows them to be laid away from water.
Genes control the sex of a developing embryo.
Genes control the sex of a developing embryo.
to provide nourishment to the developing embryo in a seed
The endosperm does. It acts much like yolk in an egg does for the embryo developing in the egg: provides the necessary nutrients for the developing embryo to grow from.
sex
an embryo
the uterus
developing embryo.
A mammal embryo is the developing baby inside the mother.
Three layers develop in an embryo .
seedcoat