Answer:
Grading system helps students figure the amount of knowledge they have gained. Grades can also help students making decisions about their career. Without grades, how students would show how much they have learned?
Explanation:
The correct answer is D. by perspiration.
<span>The white blood cells.</span>
Biocontrol strain,Bacillus sp.EN71-1 ,Rahnella aquatilis HX2 ,strains of Enterobacter ,agglomerans,Psedomonas spp. ,etc are controlled by a beneficial bacteria.