It may be determination (not sure though)
If someone is carrier...it means it is heterozygous !
and more accurately...it is heterozygous recessive !
8 weeks is when an embryo shows a beating heart and a complete central nervous system.
Answer:
The gravitational effect of Earth has slowed the rotational period of the moon to match it's orbit.
Explanation: As the moon orbits Earth, Earth is also orbitting the sun. Due to this we see the same side of the moon at all times.