Question

Put the items in the correct order. Below is a sequence of events. Place them in the order they should occur, number 1 being the first item. Select the step number from the drop down next to each item. Items to order: 1. Blastula 2. Fetus 3. Zygote 4. Gastrula Blastula Fetus Zygote Gastrula

Answer 1

ANSWER:

The correct order is-  Zygote, Blastula, Gastrula, Fetus.

EXPLANATION:

• The embryo develops from the zygote which is formed when the gametes fuse in the process of "fertilization".
• The zygote undergoes cell division to form blastula which is a "ball of cells".
• Gastrula leads to the rearrangement of cells of the blastula into three layers that differentiate into different systems of organ.
• The last stage is the fetus which then develops into a baby.