B.
All dentist equipment is used in the mouth. Many deseases, bacteria and viruses are transmitted trough saliva, and not all of these are weak. So, that is why we clean the dental operatory, to lower the chances of transmitting anything.
Hope it helped,
BioTeacher101
B-monomer
I am not sure about the second one but i think it's C
<span /><span>Rapid groundwater withdrawal also
referred to as long term water level declines caused by sustained groundwater
pumping, is a significant issue associated with groundwater use. Possible
consequences of rapid groundwater withdrawal include;</span>
<span>
</span>
(a) Reduced
surface water supplies
<span> (b) </span>Lowering
of the water table
<span> (c) </span>Water
quality concerns
<span> (d) </span>Land subsidence
