Homologous structures have the same basic structure and develop from the same embryonic tissue, but they may serve different functions in different species.

Analogous structures are structures that have different basic structures and develop from different embryonic tissues, but they serve similar functions in different species.

Vestigial structures are structures that have no apparent function in a particular species, but they are homologous to structures that serve a function in other species.

Neuroectoderm is not a germ layer, but rather a specialized region of the ectoderm that gives rise to the nervous system.

Metamorphosis is not a stage of embryonic development, but rather a process that occurs after birth in some animals, such as insects and amphibians.

The yolk sac is not an embryonic membrane, but rather a structure that provides nutrients to the developing embryo.

The placenta does not produce hormones, but rather facilitates the exchange of gases, nutrients, and waste products between the mother and the fetus.

Determinative cleavage is not a type of cleavage, but rather a process by which the fate of each blastomere is determined early in development.

Emboly is not a type of gastrulation, but rather a process by which cells migrate from one part of the embryo to another.

Histogenesis is not a type of organogenesis, but rather a process by which tissues are formed from cells.

Direct development is not a type of metamorphosis, but rather a process by which an embryo develops directly into a juvenile without undergoing a larval stage.

Viviparity is not a type of reproductive strategy, but rather a mode of development in which the embryo develops within the body of the mother.

Genetic disorder is not a type of developmental anomaly, but rather a condition caused by a genetic mutation.

Artificial selection is not a type of evolutionary adaptation, but rather a process by which humans select and breed organisms with desired traits.

Tree of life is not a type of phylogenetic tree, but rather a concept that represents the evolutionary relationships among all living organisms.