Natural selection needs competition in order to take place.
Natural selection is the process by which organisms that are better adapted to their environment tend to survive and reproduce more successfully. Over time, this results in the evolution of traits that better suit the changing environment.
Darwin developed The theory of evolution by natural selection.So, to answer you question, all of it!You need to make a distinction between evolution, the change in allele frequency over time in a population of organisms, and natural selection, the nonrandom survival and reproductive success of randomly varying organisms. Natural selection is the main driver of evolution.
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.
The need for a change itself. For example, the need to migrate in order to keep up with food sources would bring an organism into another territory that their bodies might not be adjusted to. Rather than dying off, the "fittest" organism of that breed might mate with another "fit" organism, and after - guessing - 20 generations or so, genetic changes will have made that territory the most suitable environment for that organism.
Evolution challenges the design argument by providing a natural explanation for the diversity and complexity of life on Earth without the need for a designer. Through the process of natural selection, organisms adapt and change over time, leading to the development of new species. This natural mechanism of evolution undermines the argument that a designer is necessary to explain the complexity of life.
No, it's the other way around: descent with modification is what you need for natural selection to happen.
in need helpl asap
Compete? The need to be a moron. Complete? The lack of natural selection.
Survival of the fittest is a not quite accurate phrase for natural selection. Natural selection is, The non-random survival and reproductive success of randomly varying organisms.
We need vegetation because it gives other animal a place to live. In order to protect the ecosystem of that place and also the gene pool for the survival of future generations
people, rats, and batsYou only need one - its called death.
natural selection occurs when animals need it
by having different varieties in your body and how they both need something to survive.
Becauase they need to adapt to the new environment to enter the bodies
Because that is what evolution is, the tinkering process of natural selection working with what it has against the immediate environment. Evolution does not plan ahead and can not order parts to need, but must take what it has and adapt it to the time and place it is in. So, you are still a tetrapod, a four legged mammal, but you are bipedal due to the selective pressure on humans to stand erect. Natural selection, in the immediate environment, cobbled together an organisms that probably knuckle walked into an organism that walks erect in an obligatory manner.
Natural selection is the process by which organisms that are better adapted to their environment tend to survive and reproduce more successfully. Over time, this results in the evolution of traits that better suit the changing environment.
because animals need a place to live just like people