We get weaker because put yourseld undersoemthing but not too long bc youll pass out but youll notice youll get weaker. so theres your answer buddy.
Answer
At week 5-6 of gestation, the baby’s heart starts beating.
Explanation
Fertilization occurs in week 3 followed by implantation in week 4.In week 5 the levels of hormones increases with formation of the baby’s heart and circulation system. In week 6, the neutral tube closes followed by development of structures necessary to form eyes and ears. The head of the baby develops at week 7 followed by nose in week 8 and toes in week 9.
Mitochondria by using cellular respiration to make ATP
