By R Robinson
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Extra resources for Biology 4 vol
When this occurs, especially if the patient has been on more than one regimen of medicines, a virus resistant to all available medications can be selected for. At this point, little else can be done. One major concern about these individuals is that if they are still sexually active or continue to share needles, they will transmit resistant virus. This is being documented more frequently. New medications are being studied that may be able to overcome this resistance problem by attacking different sites of viral production, or those that are not affected by mutations in the resistant virus.
The search for food was an ongoing process, and the collected items were consumed shortly after being found. The abundance of food was very dependent on periodic variations in weather and natural disasters such as flood, fire, drought, and severe cold. The beginnings of agriculture rest with individuals who learned to plant seeds of edible crops or keep a small herd of goats or maintain a flock of chickens. The transition to sustainability involved using the milk of the goats, or gathering eggs, rather than butchering animals as soon as possible for meat.
Some traits may not be adaptive but simply leftover vestiges of traits that once were adaptive. A given trait can also be “preadapted” if it was formerly adaptive under some prior set of conditions now gone but is later co-opted as the basis of a new adaptation under some new environmental conditions. For instance, it is likely that bird feathers were initially important for temperature regulation, rather than for flying. S E E A L S O Community; Convergent Evolution; Evolution; Natural Selection; Parasitic Diseases; Pituitary Gland; Population Dynamics; Predation and Defense; Sexual Selection; Symbiosis Eric R.
Biology 4 vol by R Robinson