+/+ = mutualism
+/0 = commensalism
+/- = parasitism or predation
Answer:surface
Explanation:
Just believe me miss gorl
The most hazardous to his health is lead poisoning. It is because Aaron is still young and he doesn't know mostly all of the things around him and the things that which is bad and good for him. Considering he is a child, he is likely exposed to materials such as toys and he would not know that some of these toys are contaminated with hazardous materials that could contribute to lead poisoning.
The 10x objective... it's not zoomed in all the way, but it will provide a large field of vision to locate the specimen. Then after it's located you switch to the 40x objective to zoom in on a the specimen to observe it.
