The answer is diphtheria. The symptoms of diphtheria usually track an incubation period of two to five days. Symptoms primarily are general and nonspecific frequently approaching a typical viral upper respiratory infection. Respiratory taking part usually starts with the sore throat and minor pharyngeal inflammation. The progress of the confined to a small area or coalescing pseudo membrane be able to happen in any part of the respiratory tract. The pseudo membrane is regarded as by the development of a dense, gray debris layer composed of a combination of dead cells, fibrin, red blood cells, white blood cells, and some organisms.
The stomata and their guard cells allows this happen.
Stomata is like a hole or gap on a leaf, most of them are present in a bottom side of the leaf, since waxy cuticle is not present over there. And 2 guard cells make up a stomata.
Guard cells are able to control the size of the stomata, depending on the situation. For example, the guard cells close up during day time because a lot of sunlight may cause more water loss.
In conclusion, guard cells and the stomata are the main structures that allow carbon dioxide and oxygen (water too) diffuse in and out of leaves.
The answer is (1) !!
it is one direction, from sun to produces to consumer !!
