It means a revervoir that is man-made (not natural).
Because when exercising your heart pumps more blood to your body and
it has more space to fill so it beats faster
Answer:
1. The one nearest the surface is the "zone of aeration", where gaps between soil are filled with both air and water. Below this layer is the "zone of saturation", where the gaps are filled with water.
2. Larger pores mean less friction between flowing water and the sides of the pores. Smaller pores mean more friction between flowing water and pore walls and more twists and turns for the water to navigate. A permeable material has a greater number of larger, well-connected pore spaces. An impermeable material has fewer, smaller pores that are poorly connected.
3. A cave is any cavity in the ground that is large enough that some portion of it will not receive direct sunlight.
A cavern is a specific type of cave, naturally formed in soluble rock with the ability to grow speleothems.
4. The size of the pores underground rock material has and if the pores are connected
5. Karst regions are formed when there is a chemical reaction between the groundwater and the bedrock. As rain, streams, and rivers flow over the earth's surface, the water mixes with the carbon dioxide that naturally exists in air, and the soil becomes acidic and corrodes the calcium carbonate rock. The carbonate solution seeps into fissures, fractures, crevices, and other depressions in the rock. Sinkholes develop and the fissures and crevices widen and lengthen. As the openings get larger, the amount of water that can enter increases.
The functional unit of the kidney is nephron. Kidney comprises two kinds of nephrons, each situated in distinct sections of the renal cortex, that is, juxtamedullary nephrons and cortical nephrons. A nephron constitutes of a renal tubule, renal corpuscle, and the associated network of capillaries. The nephron is accountable for eradicating waste from the body.
The functional unit of lungs is alveoli. They resemble a cluster of grapes, they are thin and possess moist walls. They are a single layer of cells enveloped by a layer of capillaries. The main function of the lungs is respiration. The alveoli help one to breathe, by conducting the process of gas exchange.
