A group of cells that performs<span> a similar </span>function<span> is known as a tissue. Multicellular organisms such as animals all contain differentiated </span>cells<span> that have adapted to </span>perform<span> specific </span>functions<span>. These differentiated </span>cells group<span> together to form tissues.</span>
A gas commonly found in smog is ozone. Correct answer: A
Smog generally occurs in the lower part of the atmosphere is composed mainly of tropospheric ozone (O3), primary particulate matter such as pollen and dust; and secondary particulate matter such as sulphur oxides, volatile organic compounds, nitrogen oxides (NOx) and ammonia gas.
