Lesson 20.3 – Pregnancy | Crossword
Across
3. | a membrane that develops around the implanted embryo |
5. | the merged chorion and endometrial tissue that surrounds, protects, and nurtures a developing fetus |
7. | types of embryonic tissues that will eventually constitute the three main types of tissues in the body |
8. | a membrane that forms a fluid-filled sac, which cushions and protects a developing fetus |
9. | the process by which embryonic cells develop into cells with specific structures and functions |
10. | the process by which an embryo burrows into the endometrial lining of the uterus |
11. | the period of time between fertilization of an ovum and the birth of a baby |
Down
1. | the process by which organs belonging to the developing fetus take their familiar locations in the body |
2. | a structure that connects the developing fetus to the placenta to provide the fetus with nutrients required for growth |
3. | the process through which a single-celled zygote divides into many cells |
4. | a ball of cells formed by the cleaving zygote as it travels into the uterus |
6. | a ball of cells formed by the cleaving zygote, and which implants in the uterus |