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A position in which the feet or buttocks of the foetus appear first during birth.

A brain is an organ that serves as the center of the nervous system in all vertebrate and most invertebrate animals. Acts on the rest of the body both by generating patterns of muscle activity and by driving the secretion of chemicals called hormones. The brains of all species are composed primarily of two broad classes of cells: neurons and glial cells.

Country on the Balkan Peninsula in southeastern Europe.

Birthday (b)

(plural) Single-celled microorganisms that make up a domain of prokaryotes.

In geology, a boulder is a rock fragment with size greater than 256 mm in diameter.

A brain is an organ that serves as the center of the nervous system in all vertebrate and most invertebrate animals. Acts on the rest of the body both by generating patterns of muscle activity and by driving the secretion of chemicals called hormones. The brains of all species are composed primarily of two broad classes of cells: neurons and glial cells.

Country in Western Europe.

Type of gas burner that produces a single open gas flame, commonly used as a heat source in laboratory experiments.

Birthday (a) (used in a sentence)