The answer to this question is located on google
Can survive in muddy wallows, but must have permanent access to water in dry season because of complex skin physiology. (Will crack if exposed to air for long periods).
Water habitat must be deep enough for submersion with nearby grassland for foraging.
The correct answer for this question is this one: "b. Air pollution"Air pollution can cause markedly shorter life spans, along with chronic respiratory problems in humans and animals.
There exists the same question from other source with the following choices:
<span>a. Water pollution
b. Air pollution
c. Global warming
d. Deforestation
e. Acid rain</span>
