Compounds are made up of molecules
C. Trawling
I just answered that question, trawling is the correct answer
After the zygote begins to divide, a fluid-filled ball of cells, called blastocyst attaches to the uterine wall.
<span>It is the stage of implantation during the prenatal development. The blastocyst consists of an inner cell mass and the outer layer -the trophoblast. Trophoblast surrounds the inner cell mass and a fluid-filled cavity - blastocoele. Inner cell mass will form embryo and trophoblast gives rise to the placenta.</span>
B b
B BB Bb
b Bb bb
BB = blue
Bb = green
bb = yellow
1 blue: 2 green: 1 yellow
