Which layer of the earth do convection currents occur in?

Which statement best describes a keystone species? o a. it has littlelmenetic variation. it has an extremely high population. 0 b. 0 c. it remains unaffected by all environmental changes. od. it has a strong influence on the ecosystem. 0 e. it's the first species to populate a new ecosystem.

This is one of the five kingdoms in the older biological succession. organisms in this kingdom are prokaryotic

The bacteria found in soil is usually harmful and measures are taken to remove any traces of microorganisms. true or false