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Answer: c. Blood is composed of the formed elements and plasma. Plasma is the liquid portion of blood. The formed elements consist of the cells and cell fragments. The erythrocytes (red blood cells), platelets, and leukocytes (white blood cells) are all considered formed elements.eutrophil. d. Monocytes. e. Eosinophils. Answer: b. Basophils are the least abundant leukocyte. Leukocytes are the white blood cells. The order of frequency of the leukocytes is: neutrophil, lymphocyte, monocyte, eosinophil, basophil.
The chart shows which elements are most abundant by mass and by volume. As you can see, Oxygen is the most abundant element in the Earth's crust (lithosphere) by both mass and volume. Silicon is the second most abundant element by mass.Potassium is the second most abundant by volume. All of the different amounts are right on the chart, so there is no need to memorize them. The most important thing to realize is that Oxygen is by far the most abundant element in the Earth's crust.Remember that this refers to Oxygen in compounds, not Oxygen as a gas! This Oxygen is present as part of solid chemical compounds in the rocks and soil.he most important thing to realize is that Oxygen is by far the most abundant element in the Earth's crust. Remember that this refers to Oxygen in compounds, not Oxygen as a gas! This Oxygen is present as part of solid chemical compounds in the rocks and soil.