Here's a breakdown:
* Embryo: This refers to the developing organism from the moment of fertilization until the major organs are formed. It's the initial stage of life, where the organism undergoes rapid growth and differentiation.
* Fetus: In mammals, after the major organ systems are formed, the developing organism is called a fetus.
The term "embryo" is often used broadly to refer to the early stages of development in all organisms, but the specific definitions may vary depending on the species.
For example:
* In plants: The term "embryo" refers to the young plant developing within a seed.
* In animals: The term "embryo" refers to the developing organism from fertilization until the later stages of development (e.g., metamorphosis in insects, hatching from eggs in birds, etc.).
Understanding the different stages of development is important for studying biology, evolution, and understanding the processes of life.
