Evolution occurs in all life, all the time.
To determine if evolution by natural selection is occurring in a cactus population, you would need to observe changes in the heritable traits of the cacti over time, caused by differences in survival and reproduction. This would indicate that certain traits are being favored, leading to a shift in the genetic makeup of the population.
Cacti are primarily a product of natural selection, as they have evolved over millions of years to adapt to their arid environments. Their unique features, such as thick skin and water-storing tissues, are traits that have been favored in survival. However, some cacti have also been subject to selective breeding, particularly in cultivation for ornamental purposes, resulting in various hybrid varieties. Thus, while the majority of cacti are a result of natural selection, selective breeding plays a role in their diversity in cultivated settings.
Cacti are only natives of the Americas. If any are found in the Sahara they were planted there and not naturally occurring.
Cactus is Singular. Cacti is Plural. Examples: I saw a cactus at the national park. I saw cacti at the natural park. This is not correct: I saw a cacti at the national park.
A natural growth of spines in the body.
Australia has no native cacti, so there are no cacti occurring naturally in the Great Victoria Desert. However, introduced cacti such as the prickly pear have spread as far west as the Great Victoria Desert.
No, cacti are strictly plants of the Americas. If they are found elsewhere they are not natural and would be considered an invasive species.
many cacti, succulents and coastal plants grow in naturally occurring alkali soils
yes because that would be their natural habitat
The Galapagos Islands are home to over 300 plant and animal species, such as cacti around 11 metres tall, marine iguanas, sea lions. The organisms are endemic to that particular island and its relatives on the other islands will have varying physical features. It is these organisms that gave Charles Darwin, who visited this island in 1835, the idea of natural selection, as their physical features are great evidences of many years of evolution.
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Cacti are only found naturally in the Americas. If any show up in the Arabian Desert, they were planted there. They do not grow naturally in that desert.