What is the term for a baby egg in biological development?

The term that refers to a baby egg in biological development is "zygote." This is the stage that follows the fertilization of an egg by a sperm cell. When an egg and sperm unite, they form a zygote, which is the earliest developmental stage of a new organism. The zygote undergoes several rounds of cell division, leading to the formation of an embryo.

The embryo stage refers to the developmental phase where differentiation occurs, and the basic structures of the organism begin to form, while the fetus stage refers to a later stage of development characterized by more advanced growth and development of the organs and body systems.

Gametes are the reproductive cells (sperm and egg) that carry genetic information, but they are not the early stages of development. The correct choice aligns perfectly with the sequence of development, making it integral to understanding the life cycle of an organism.