How do neon tetras breathe?

How do neon tetras breathe? Most fish breathe exclusively through their gills, although some have lung-like organs that allow them to come up for air. There needs to be a lot of oxygen dissolved in water for fish to survive, which is not a problem in the wild. In the aquarium, however, aquarists have to […]

How do excavators work?

How do excavators work? The excavator attachments require fixed tracks in order to function. The tracks are operated by means of manipulating gears that are fused with the engine. Use of the gears allows the hydraulic excavator to move backwards and forwards. Turning the machine involves replacing one track with another. How does a cat […]

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