Due to the atomic mass, different for every element, hydrogen is the lightest element and it's a gas at room temperature due to its properties like point of ebollition. iron is a heavy solid because it has a high atomic mass and a high point of fusion(temperature needed to melt it).
The layers from the core to crust composed of the following:
the crust, the mantle, outer core and inner core. Each layer composes of
substances such as liquid, iron, plastic, magnesium, selenium and aluminum. The
earth’s layer is composed of four layers which are mentioned earlier in this
paragraph. These layers protect life from the earth’s very hot core found in
the center of the planet.
Leaves are the only natural item listed.
Pesticides, smog, and disposable products are not natural.
Answer:
I would say disease.
Explanation: All of the other choices are weather based, and I don't think Mother Nature chooses natural disasters based on the population. Also, the more people in a population, the more people that the disease could spread to.
Answer:
The signs of inflammation that are associated with histamine release is the expression of redness, heat, swelling, and pain.
Explanation:
The basophil- mast cell product, histamine, is a part of the innate immune mechanism in the body of higher animals to fight foreign agents. Since these molecules are kind of protective measures in the body, they do not lead to loss of function of the affected part where they are localized, however, they do increase the vasodilation and permeability of the blood vessels to white blood cells, mainly neutrophils and macrophages to fight microbes, and consequently lead to swelling, redness, heat and pain which can also be due to the secretion of bradykinin. Therefore, inflammation due to histamine is associated with option E.