Species that are especially intolerant of physical disturbance to their environment are referred to as .

a. ecosystem engineers
b. indicator species
c. native species
d. exotic species
e. pioneer species

Option B) Indicator species

Explanation:

As their name implies, Indicator species are organisms such as animals, plants, or micro-organisms that can be used to detect the disturbances or alterations occuring in the habitat.

This indicator species are especially intolerant of any physical disturbance ranging from pollution, to food shortage etc.

b a mature ovary of a plant.