2.4 The diagram below shows two species of pistol shrimp (A and B). The shrimps
live in shallow, tropical seas on opposite sides of Panama. Panama is a
narrow strip of land which today joins North America and South America. It
was formed by land moving up from beneath the sea. Panama has separated
the Pacific Ocean and the Caribbean Sea for the past 3 million years.
Pacific Ocean
Species A
Panama
Caribbean Sea
Species B
2.4.1
Describe how the two species of pistol shrimp could have developed
from an ancestral species of shrimp.
(7)
2.4.2
Explain what effect the process you described in QUESTION 2.4.1
had on the biodiversity of the pistol shrimp.
(2)
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