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What scientific evidence is there for the exact cause(s) of the decrease in the population of sea turtles?
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- The endangered Amargosa River pupfish (Cyprinodon nevadensis amargosae) lives in Death Valley, where different populations of the species live in total isolation from one another in tiny permanent pools and short stream segments (Lema and Nevitt 2004). Although these populations have been separated from one another for only 400 to 4000 years, males in some places aggressively defend territories and court females drawn to them, while males in other populations are not aggressive toward one another and do not defend territories. How could these changes occur so rapidly? How might you establish experimentally that the hormone arginine vasotocin (AVT) decreases aggressive behavior in pupfish? If the hormone does lower aggression in this species, what predictions could you make about AVT or about AVT receptor protein differences between territorial and nonterritorial males of the same species? please don't write from any online sourceBecause many of the key mechanisms of evolution activate when sperm and egg combine, volutionary change happens faster for organisms with short life cycles (viruses, bacteria, fruit fly, yeast) compared to organisms with long life cycles (humans, elephants, tortoises). True FalseAccording to "The Complex Evolution of Homo sapiens", what happened to large animals in the areas where our species migrated? A.Nothing happened to large animals when we migrated into their territories B.They increased in number soon after we migrated into their area C.They died out soon after we migrated into their area D.We domesticated them soon after we migrated into their area
- What are some of the traits present in the newt population described in the article?How might these traits change from individual to individual? (Hint: Do you think the newts are all exactly the same color or size?)3c: How could the total road kills go down, as the nests are going up? (Nests are something scientists use to estimate the size of adult swallows surviving long enough to reproduce.) 3d: What about the environment contributes to a change in the average wing length in the cliff swallow population over generations? 3e: What is the role of natural selection in explaining the change in average wing length in the population over generations?Remote islands that are far from any mainland are home to many species that have evolved distinctive adaptations to live in the unique island conditions. (e) Some birds evolve adaptations that include losing the ability to fly. Explain how a species of bird on a remote island could lose the ability to fly over time.
- Normal text Arlal 10.5 3. 1. The stickleback would swim from the ocean up to fresh water lakes to spawn (lay eggs). When the land rose and cut off the river passage back to the ocean, what challenge did the stickleback face? 2. Ten-thousand years later, how have the stickleback in the freshwater lakes changed or evolved? 3. The ocean has many predatory fish that could catch and eat the stickleback, what are at least two characteristics that ocean stickleback evolved? 4. Why are stickleback spines a liability (an unfortunate characteristic) in Bear Paw Lake? 5. What FOUR letters make up the stickleback DNA? Sign outcalculate the number of Physignathus cocincinus in each region, and determine the mean density of lizards in each habitat (A, B and C). Provide a legend to Table 2. Using the literature, explain how would you go about collecting the sort of data shown in Table 2?拳 1 2 3 4 77811 Geologists searching for clues to the ancestors of modern-day vertebrate land animals should look in layer beds. of the fossil A) 1 B) 3. D) 4
- Consider the evolution of the population of a species of small rodents. Assume that the number of males and females are nearly equal. Due to statistical data one can assume that each female remains a juvenile for one year and then becomes an adult, and that only adults have offspring. The reproduction rate is 2. The adult surviving rate is α. The juvenile surviving rate is 2/5. Initially the population counted 100 females and 40 juveniles. What values of the adult surviving rate will ensure that the population stabilize?The type III survivorship curve is found in species in which most individuals die when they are young but a relatively small number of older individuals can live for a long time. Many of these organisms have very long lifespans. This would appear to contradict the evolutionary theory of aging because most individuals die when young but lifespan is long. How can you explain this apparent contradiction. Group of answer choices -older, larger individuals have most of the offspring -all type III organisms have very slow metabolisms -type III organisms are trying to prove evolution wrong -type III organisms die at a constant rateDiscuss the trade-offs associated with the following life history traits: a. Metamorphosis b. Body size c. Diapause d. Samelparity / Iteroparity e. Age at sexual maturity
