Question

2.which of these animals have evolved to sleep standing up as a survival mechanism? (multiple choice)
a. horses
b. elephants
c. flamingos

Explanation:

Horses have evolved to sleep standing up (using a stay - apparatus in their legs) to quickly flee from predators. Elephants can sleep standing up as it helps them be alert to threats and conserve energy (they also lie down sometimes). Flamingos sleep standing on one leg, which helps with balance, thermoregulation, and vigilance against predators. So all three animals have this adaptation as a survival mechanism.

Answer:

A. Horses, B. Elephants, C. Flamingos