I believe the answer is retrovirus
Answer:
Evolution is the process that allows the appearance and elaboration of signals, but the key question is: what selective forces led - and lead - to the appearance of color characteristics and chromatic patterns ?, not only in the scope of a species concrete - such as the black bib of the common sparrow (Passer domesticus) - but also within each family or even within a wider framework, for example the light colored spots that we see in the outer feathers of the tail of the bird species Dr. Senar explains the methods and results of the experiments performed so that the reader can compare their interpretation with the scientific advocacy, but also involve other alternative hypotheses. For example, the supposed signals of dominance Do they represent correlations with age and sex, which in turn correlate with dominance? And what can we say about deception, of those signs that exaggerate the status of an individual? The presentation of the different alternatives offers the reader the opportunity to detect the complexity of the selective forces and the difficulty of designing clear and conclusive experiments. In a similar way, the author presents the multiple hypotheses that address sexual selection and delayed maturation of plumage, thus facilitating the reader, understanding of the different topics discussed and a better appreciation of the elegant experiments that have been used to formulate and defend some of these hypotheses. Camouflage is treated in a separate chapter, but Dr. Senar not only focuses on the colors of the prey, which affects the object of investigations, but also on the color of predators, whose study has been the subject of much attention minor The interpretation of color as a bioindicator is an innovative approach that is proposed towards the end of the book. This is the first time that this possibility was raised, but, as the author points out, if the birds determine the quality of the habitat by the color of the potential couple that lives in it, there is no doubt that we should also be able to determine the quality of a habitat using similar means. Experiments that allow us to evaluate this approach are described throughout the book.
Answer:
Limiting factors control the numbers of individuals in a population, sometimes maintain it at or near the carrying capacity. 4. Analyze the impact a nonnative species might have on a native species in terms of population dynamics. Nonnative species might out-compete the native species or might prey upon them.
Explanation:
1)The approximate length of a adult rat’s small intestine can reach 80 centimeters long.
2)The small intestine
is so large compared with other organs because it is where most digestion (macromolecules of food are
broken down into nutrients) and absorption of nutrients occur. With more area of surface in the organ the more
digestion can occur.
3) Caecum is a part of the colon that contains a lot of bacteria that aid in digestion of plant material. In rats the cecum is larger than human's becausethey eat more seeds and grains.
This lead us to believe that rats are more herbivores than carnivores.
4) function of colon: Colon extracts water and electrolytes from solid wastes before they are eliminated. It's also where bacteria ferment unabsorbed material occurs and from that they can produce vitamins important for our body, such Vitamin K.
5) if the cecum is large it means the rat is herbivore because they host a lot of bacteria, which aid in the enzymatic breakdown of cellulose; If the cecum is small the rat is carnivore, since their diets contain little or none of plant material and the cecum is often partially or wholly replaced by the appendix.
