How a glass frog hides blood while resting
An A2 reading about observing glass-frog blood with light and sound.
La rana transparente ha escondido su sangre
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About this article
Level A2 Reading focus
What you'll learn
Present perfect with han, ha and hemos, ya, todavía no, and regular participles.
Students reconstruct a study showing that a resting glass frog stores red blood cells in its liver.
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