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Scientists train bees to detect drugs

Insects have identified heroin and cocaine odors; Researchers suggest that animals could be used at airports. Bees could replace sniffer dogs at airports, researchers suggested Researchers at the University of Cologne in Germany say they have trained bees to identify heroin and cocaine odors.
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Ecological Relations (continued)

Interspecific (between individuals of different species) Mutualism Association between individuals that may be obligatory (symbiosis) or optional (protocooperation). In the obligatory association, both individuals benefit, but each species can only live in the presence of the other. Eg lichen, oxen and microorganisms of the digestive system.
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Emphysema

Emphysema is very rare in people who have never smoked. It is the complete obstruction of the bronchioles, with increased resistance to air passage, especially during expirations. Thus, rupture of the walls of the alveoli may occur, with formation of large cavities. This decreases the lung's efficiency in absorbing oxygen and there is an overload of the heart to compensate for lung deficiency.
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Molecular Evidence of Evolution

The comparison between DNA molecules of different species has revealed the degree of similarity of their genes, which shows the evolutionary relationship. The same is true for proteins that ultimately reflect genetic similarities and differences. Cytochrome c is a protein present in all living beings that do aerobic respiration, consisting of 104 chained amino acids.
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The spermatogenesis

Process that occurs in the testicles, the male gonads. They secrete testosterone, the sex hormone responsible for the onset of male sexual characteristics: increased beard and body hair, more developed muscle mass, severe voice tone, etc. The cells of the testes are organized around the seminiferous tubules in which sperm are produced.
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Kingdom of Animals

Invertebrates Animals make up a kingdom of over one million species. However, fossils found reveal that a much larger number of animal species have lived on Earth but are now extinct. We living things are many and come in many shapes and sizes - from microscopic bodies like the mite to gigantic bodies like the blue whale.
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