Answer :
Final answer:
Human development from fertilization to birth is a complex process that takes place over three trimesters. It starts with fertilization, leading into the first trimester where major organs start forming, followed by further growth and development in the second and third trimesters.
Explanation:
The development of a human from fertilization to the end of the 9th month of pregnancy is a complex, multi-stage process. This journey begins with fertilization when the sperm successfully penetrates the egg creating a single cell called a zygote. This single cell rapidly divides and grows into a blastocyst which implants itself in the uterus. This marks the start of the first trimester.
The first trimester is characterized by significant developmental milestones such as the development of the heart, spinal cord, and the initial formation of the brain. By the end of the first trimester, the fetus is fully formed. In the second trimester, the baby continues to grow, developing muscles and starting to move. This is also when the mother may begin to feel the baby moving. Finally, during the third trimester, the baby continues to grow, and the lungs mature in anticipation of birth. By the end of the pregnancy, the baby is fully developed and ready for birth.
Learn more about Human Development here:
https://brainly.com/question/34225501
#SPJ1