Examlex
In which structure do pollen grains develop?
Lungs
The pair of respiratory organs in the chest of humans and many animals, responsible for the exchange of oxygen and carbon dioxide.
Prenatal Period
The developmental period before birth, spanning from conception to birth.
Blastocyst
An early stage in embryonic development characterized by a sphere of cells surrounding a fluid-filled cavity and a cluster of cells that will develop into the embryo.
Teratogen
An agent or factor that causes malformation of an embryo or fetus, including certain drugs, chemicals, and infections.
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