What are the direct evidence of evolution?

Answer 1

Evolution is the change in allele frequency over time in a population of organisms. This is observed and observable. In plant this can be seen in one generation by the process of polyploidy. Where chromosome number can double, for example, in one mating and thus fulfill the definition of both evolution and speciation.

Answer 2

1. Rudimentary parts. For example, whales and snakes, who have absolutely no use for a pelvis or legs, still have useless remnants of these

hidden internally. This shows that their ancestors did have legs, and eventually evolved to not need them anymore. Therefor, they slowly shrank over time to conserve energy that would be wasted maintaining such a useless part. Another example are the nipples on many male animals, which show evidence of a hermaphrodite ancestor.

2. The range of given organisms. For example, on most islands, there are no native terrestrial mammals or amphibians because they wouldn't be able to cross an ocean or sea.

3. Humans even use the same characteristics of evolution to our benefit. Humans will pick organisms best suited to our benefit, whereas nature selects organisms best suited to survive and reproduce. In both cases, they get the opportunity to have offspring, which carry these desirable traits, and the process continues. Over time, a remarkably distinct variety can develop, for example, the Berlin short faced tumbler. In nature, we already see examples of this, as new varieties of pesticide resistant insects and antibiotic resistant bacteria evolve.

Answer 3

An example of direct evidence for evolution is found in CAM and C4 plants. Photosynthetic adaptations such as C4 and CAM plants represent alternate modes of carbon fixation that have evolved to minimize photorespiration and optimize the Calvin cycle, even in hot climates. Although rubisco catalyzes carbon fixation, the first step of the Calvin cycle, it adds oxygen to the Calvin cycle instead of carbon dioxide when carbon dioxide becomes scarce. This process is called photorespiration and consumes light, oxygen, and ATP, releasing carbon dioxide; it does not produce any sugar or ATP. The existence of photorespiration seems to be an evolutionary relic from before the oxygen revolution when the atmosphere had much less oxygen and more carbon dioxide. Rubisco's affinity to oxygen would not have mattered in this atmosphere. Over time, adaptations such as C4 and CAM plants have evolved, especially since photorespiration does not seem to benefit plants as it releases much of the fixed carbon. C4 plants "overcome" rubisco's affinity to oxygen by structurally separating the first steps of carbon fixation from the Calvin cycle and then conveying the carbon dioxide atoms to the Calvin cycle in the bundle-sheath cells. This prior step is carried out in the mesophyll cells by PEP carboxylase, which has no affinity for oxygen and a much higher affinity for carbon dioxide than rubisco. CAM plants also incorporate carbon dioxide into organic intermediates before entering the Calvin cycle. However, they open their stomata and fix carbon into organic acids at night, closing their stomata during the day when the carbon dioxide is incorporated into sugar in the chloroplasts with the help of the light reactions. Both C4 and CAM adaptations have evolved to minimize photorespiration and enhance sugar production.

Answer 4

Two related examples are comparative morphology and comparative embryology. Look at the fore limb of your dog or cat and you can see, bone for bone, common ancestry between you and your pets. Now, of one looks at the early development of all organisms under discussion here one will see remarkable similarities in embryological development. HOX control genes doing pretty much the same things in you and your pets. Special creation could not explain this in a satisfactory manner, but evolutionary processes do explain this very well.

Answer 5

MicroevolutionMicroevolution is when bacterium or small invertabrates are observed to have

small-scale changes in a few generations that are not big enough to create a separate species. But, it proves that living things change to adapt to their environment. With more time, this could create separate species, genera, etc.

Animal BreedersAnother example are animal breeders. They can take a wild animal like a pigeon and breed it so that it has the characteristics they want. This proves that animals can change drastically with the process of natural selection. Animal breeding is like an artificial, sped up version of natural selection. Charles Darwin's' ObservationsCharles Darwin observed that different finches had beaks specifically designed for the type of food they ate. This showed that their beaks evolved to be best suited for the food items that they ate.

Answer 6

Like, Omg! We're asking some questions and you're letting us ANSWER it?! How Absurd.

Answer 7

There is no direct evidence that evolution exists. This is why evolution is still labeled as a theory, not a fact.

Answer 8

humans

Answer 9

A.