B as it's not government regulations, technology or funding
Explanation: The shape of a river's stream bed affects the speed and eroding power of a river by influencing the amount of friction between the water flowing through the river and the stream bed below. Friction is the force that opposes the motion of one surface as it moves across another surface. In a river, there is friction between the flowing water and the stream bed beneath it. Where a river is deep, less water comes into contact with the stream bed, so there is less friction. The reduced friction means there is less opposition to the water's motion, so the river flows at a greater speed and has more kinetic energy for erosion. On the other hand, where a river is shallow, more water comes into contact with the stream bed, so there is more friction. The increased friction means there is more opposition to the water's motion, so the river flows at a lesser speed and has less kinetic energy for erosion. Also, the roughness of a stream bed covered with boulders and other obstacles causes the water to flow through the river in a turbulent fashion. This could cause the river to move slower in some cases or erode more in other cases.
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Interstitial fluid is an extracellular fluid that fills the spaces between most of the cells of the body (“bathes the cells“).
The total body water is divided between the intracellular compartment (intracellular fluid) and the extracellular compartment (extracellular fluid). Extracellular fluid is then subdivided into interstitial fluid and smaller components, such as the blood plasma, the cerebrospinal fluid and lymph.
Interstitial fluid consists of a water solvent which contains sugars, salts, fatty acids, amino acids, coenzymes, hormones, neurotransmitters, white blood cells and cell waste products. The composition of interstitial fluid is not always the same, it depends upon the exchanges between the cells in the biological tissue and the blood (different composition of the fluid in different tissues). The interstitial fluid acts as a connecting link between the blood and the cells.
They can be observed in a microscope because both of them are very small to see. Mostly, they contain genetic material. Viruses need a host to keep it spreading or etc.
Humans belong to the D) chordates group
