Around the Third Month of Prenatal Development, Hormones in the Fetus

question 120

True/False

Around the third month of prenatal development, hormones in the fetus will begin sexual differentiation.

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Definitions:

Vascular Plants

Plants that have specialized structures for the transport of water and nutrients, including xylem and phloem.

Silurian Period

A geologic period and system that extends from about 443.8 million to 419.2 million years ago, noted for significant biological developments including the appearance of the first clearly identifiable land plants.

Air-breathing Animals

Organisms that intake oxygen from the air to the lungs or other special respiratory organs to sustain life.

First Land Animals

Early terrestrial organisms, primarily arthropods and amphibians, that colonized land during the Paleozoic era.