PLEASE HELP ASAP! 3.2) Read the following extract relating to the a tourism centre.

In one of China's most popular tourism centres, the park's monkeys are kept
in a very small area and regularly compete for food since it is provided in
small quantities.
It is thought that the above factors caused the monkeys to develop
aggressive behavior towards each other and towards their young. This has
led to the adult monkeys attacking and killing many of the infant monkeys.
A team studied infant mortality in monkeys for six years before ecotourism
began in 1991. They also collected data while tourists visited the animals
between 1992 and 2004.
Infant mortality had been low prior to ecotourism and was primarily caused
by disease, the team found.

3.2.2) Explain how the researchers could link the increased infant mortality
to ecotourism.
(2)​