Examlex
In mammals, gas exchange between the atmosphere and the pulmonary blood occurs in the ________.
Dizygotic Twins
Also known as fraternal twins, these are siblings born at the same time who develop from two separate eggs fertilized by two different sperm.
Fertilized Egg
An egg cell that has been penetrated by a sperm cell, beginning the process of development into a new organism.
Embryos
Early developmental stages of organisms following fertilization, before they reach the fetal stage.
Cross-Sectional Design
A study approach that examines information from an entire population or a representative sample at a particular moment.
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