assume a vertical posture

tesoke

Senior Member
USA
Persian
Hi, I cannot understand the meaning of the red part of the following sentences, from "The Official Guide for GMAT Review 2015". Would you please help. Bless you.

In arboreal snakes, however, which dwell in trees and often assume a vertical posture, the average distance from the heart to the head can be as little as 15 percent of overall body length.
 
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