Which of the following best describes the placental components of dizygotic twins?? ;One placenta,two amniotic sacs,two chorions|Two placentas,two amniotic sacs,one chorion|One placenta,two amniotic sacs,one chorion|Two placentas,two amniotic sacs,two chorions

Ce sont _____ sacs de Madame Roche.

The small air sacs in the lungs through which gases are exchanged between the atmosphere and the blood are the __.

Ventilation in birds is accomplished by expansion and contraction of the ( ). A: air sacs B: trachea C: lungs D: diaphragm E: air capillaries

which type of epithelium is thin and leaky and lines blood vessels and the air sacs of the lungs A: Stratified squamous epithelium B: Cuboidal epithelium C: Simple squamous epithelium D: Simple columnar epithelium

The chloroplast<br/>internal membrane is organized into flattened membranous sacs called<br/>_________; they, in turn, are arranged in orderly stacks called<br/>_______ that contain energy-transducing machinery. ( ) A: thylakoids, grana B: grana, thylakoids C: thylakoids, stroma thylakoids D: thylakoids, grana thylakoids