Question

order the stages of human development from earliest to latest.
note: the stages are not shown to scale.
earliest

latest

Explanation:

To order the stages of human development from earliest to latest, we analyze the stages:

1. The second image (a single - celled or early embryo stage, likely the zygote or early blastocyst precursor) represents the earliest stage as it is the initial form after fertilization.
2. The third image (a blastocyst - like structure with a cavity) comes next as it is the stage after the zygote has undergone cell division and formed a blastocyst.
3. The first image (an embryo with early body structures) is the next stage as the blastocyst implants and develops into an embryo with recognizable features.
4. The fourth image (a more developed fetus) is the latest stage as it shows a more mature form of the developing human.

Answer:

1. Second image (the circular structure with a dot in the center, representing the zygote/early embryo)
2. Third image (the circular structure with a cavity and cells around, representing the blastocyst)
3. First image (the embryo - like structure with early body features)
4. Fourth image (the more developed fetus - like structure)