Seventy percent of the plants containing chemicals useful for cancer treatment are found only in rain forests. What type of ecosystem service do these plants provide ?

The type of ecosystem service these plants provide is PROVISIONING SERVICES.

Explanation:

Ecosystem services is defined as the activities that occurs in an ecosystem which directly or indirectly enhance the well being of humans. They are grouped into four different categories which include:

--> Regulating services

--> cultural services

--> supporting services and

--> provisioning services

The PROVISIONING SERVICES obtained from the ecosystem are any benefits or products that can be gotten from nature. These include:

--> food

--> drinking water

--> wood fuel

--> natural gas

--> medicinal resources (gotten from herbal plants which can be used to manufacture drugs for cancer treatments).

d. changes in climate and historical records

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