A Unique Species of Snail Has Been Discovered in the Negev

question 15

Multiple Choice

A unique species of snail has been discovered in the Negev Desert.At night,these snails use a toothlike rasping organ in their head to scrape up porous limestone; they then digest the algae that lived in the rock pores.This scraping organ is the

• A)labial palp.
• B)radula.
• C)mantle.
• D)tentacle.
• E)crop.

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Definitions:

Loop Of Henle

A U-shaped tube in the kidney nephron essential for concentrating urine and conserving water by creating an osmotic gradient in the medulla.

Glomerulus

A network of small blood vessels located in the kidney that performs the first step of filtering blood to form urine.

Renal Medulla

The inner region of the mammalian kidney. Compare with renal cortex.

Renal Pyramids

Cone-shaped structures located in the kidneys, composed of tubules that are essential for urine formation.