I believe the answer is b.
Diffusion has a major part in this. It has proteins embedded in it that allow molecules to diffuse in and out of the cell up and down its concentration gradient.
Answer:
The sun's visible wavelengths of radiation pass easily through the atmosphere and reach Earth. Approximately 51% of this sunlight is absorbed at Earth's surface by the land, water, and vegetation. Some of this energy is emitted back from the Earth's surface in the form of infrared radiation
Explanation:
When microscope slides are stained to show blood cells, the small red blood cells that appear on the slides are much more numerous than the large white blood cells. I believe this supports the fact that each kind of cell is present in the numbers best suited to meet the needs of the body. In other words it supports the concept of having normal blood. Red blood cells as compared to the white blood cells are really more numerous. In normal cases, human blood contains about 3.6 to 6.2 trillion/ L red blood cells while white blood cells only reaches 5 to 10 billion per Liter.
