Answer:
they mutate and become immune to modern medicine
Explanation:
TMV is not an additional hazard for smokers because the humans are not within the range of hosts of the TMV virus and so the humans cannot be infected. The Tobacco Mosaic Virus is actually a single stranded RNA virus that infects a wide variety of plants and especially the tobacco plants. The main signal is the discoloration of the leaves of the plants.
<span>The male's feathers do not get longer and longer each generation because they would reach a point in which the feathers would hinder their survival. If the females preferred feather trains that would help males fly, then males would likely have much shorter feather trains.</span>
The answer is animal communication. This is the<span> transfer of information from a single or group of animals to other animals that will have an effect on the behaviour of the animals. Types of information include courtship displays, warning off others when defending territory and signalling the presence of a food source. .Animal communication is studied in many different disciplines including </span>animal behaviour<span>, sociobiology, neurobiology and </span>animal cognition<span>.</span>
