Answer:haemoglobin
Explanation:
Inside the air sacs, oxygen moves across paper-thin walls to tiny blood vessels called capillaries and into your blood. A protein called haemoglobin in the red blood cells then carries the oxygen around your body.
Explanation:
The higher the volume of water in a stream, the higher its speed and the wide its size and shape which ensures a proportionate flow rate.
To quantify how the speed of stream, we use the quantity, discharge in hydrology;
Discharge is the volumetric rate of water flow past a point at a particular time.
Discharge = 
- We see that discharge is directly proportional to the volume of water in a stream.
- It is inversely proportional to the time taken.
- We know that volume is the amount of space occupied by a body. It is function of its size and shape.
- A big water body that is deeper, wider and longer will have more wate and a greater discharge.
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We see that this is a region near the continents, so it is probable that there is the boundary of a tectonic plates around there. Since there are islands there, it is quite probable that there is a subduction zone near them which means that the oceanic crust is going below the continental one and the continental is slowly elevated. This also shows that the boundary is convergent, since transform boundaries do not lead to elevation. Near convergent boundaries, there are frequently volcanoes and shallow earthquakes. Finally, the climate near Alaska is cold and this does not depend on whether islands are near a boundary or not. So, 2 4 and 5 are correct.
The answer should be agriculture.
Agriculture means farming of crops or the rearing of animals, either for their own use or for commercial purposes. Rural area means a place away from the city, opposite of urban areas, with little buildings and most likely have a smaller population.
On the other hand, construction and manufacturing most likely is going to be common in urban area, as urban area is more likely to have more buildings being built and most of the products are made in the factories in urban areas. Therefore, the only activity that is almost practiced exclusively in rural area is agriculture. Urban areas don't have much space and well environment for agriculture activities.
Agriculture activities can be energy consuming as some may require different machines to help with farming processes such as harvesting or irrigation.
