4b) visual observations as the sample is brought near the side of the flame, in the flame, and out of the flame, 4c) odor as the fibres burn, 4d) characteristics of the ash including the colour and texture. 4e) The man-made fibers will decompose and melt. much quicker than either the animal or vegetable fibers.
Bluefin tuna swim in a holding pen in Australia. A conservation group has named three fish species that it says are at risk of extinction. The fish are threatened because of overfishing to meet the worldâs growing demand for food.
Are snakehead fish a dangerous invasive species in the USA? Invasive species, whether they are animals, fish or plants, are causing a huge problem around the world. An invasive species can cause huge disruptions to fragile, local ecosystems, as they often have no natural predators in their new habitat, take over territory and food sources required by indigenous animals for survival and sometimes even destroy terrain.