Either B and D I believe I may be wrong..
Answer:
Option A, Key stone
Explanation:
A keystone species plays a major role in an ecosystem as it is the species whose presence effects all other species in the ecosystem .In general a keystone species is always a dominant predator that feed on prey population. If it is removed, the prey population will explode and the population diversity will reduce. For example - bison, prairie dog etc.
Hence, option A is correct
People update outdated cell phones by purchasing smartphone devices.
People purchase solar panels after reading about the effects of burning coal.
People start grocery shopping online as new grocery applications are published.
Options B, C and E.
<u>Explanation:</u>
The statements that are given here talk about the change in the cultural practices of the people with the incoming of the Science and technology in their life and having an advancement of technology.
Like when people change their devices which have gone outdated to replace them with the new ones, or changing ways of shopping things from the older to new and more modern methods is change in the cultural practices because of Science.
