Randomness.
Because natural selection only preserves incremental beneficial traits to the organism and many different areas of the organism are undergoing mutation and natural selection at the same time against the backdrop of the immediate environment. If a population of organisms, subject to allele change due to natural selection, is not in a changing environment, or split in a allopatric event, then adaptive change will be very slow, or will not happen at all and selection will winnow those variants and stabilizing selection is taking place. Regression to the mean of phenotype.
All species have genetic variation. ;D
It has not reached carrying Capacity
Natural Selection is a process which individuals are better adapted to their enviorment are more likely to survive and reproduce. Say there are turtles barely hatching and there are hungry seagul waiting to be fed, the fastest ones will make it to the water safely while the slow ones are being eaten. so eventually all the turtles in the sea will become faster to get away from predators. hopefully that answered your question.
The characteristic within the population that causes natural selection to occur is that individuals within a given population are not all identical because they vary. The other characteristic that causes natural selection to occur is that some variants are better than the others.
All modern lifeforms are examples of natural selection, since they are all the result of it.
Because natural selection only preserves incremental beneficial traits to the organism and many different areas of the organism are undergoing mutation and natural selection at the same time against the backdrop of the immediate environment. If a population of organisms, subject to allele change due to natural selection, is not in a changing environment, or split in a allopatric event, then adaptive change will be very slow, or will not happen at all and selection will winnow those variants and stabilizing selection is taking place. Regression to the mean of phenotype.
yes.
Enviroment, development, and behavior are all factors besides alleles that can affect phenotypes.
Genetic drift, as it is a random process that does not necessarily contribute to the differential survival and reproduction of individuals. Variation, heritability, and differential reproductive success are essential components of natural selection.
Because all animals that exist have formed, and are being formed and re-formed, continuously, primarily by natural selection.
No, all life evolves. Bacteria evolve, viruses evolve, protists evolve, plants evolve, fungi evolve and animals evolve. Evolution is driven by Natural Selection. So, no. The evolution of all life on Earth is driven by Natural Selection: all bacteria, plants, animals, mammals, fish, insects, biochemical pathways, behaviours et cetera evolve by Natural Selection.
One.
Yes, penguins, like all animals, have gone through natural selection. Scientific evidence supports this notion.
He formulated the principle of natural selection, intersexual selection and intrasexual selection which all contributed to the study of evolution.
Natural selection is one mechanism that contributes to the diversity of life on Earth rather than demonstrating unity among living organisms. It acts on individual organisms within populations, leading to adaptations that enhance their survival and reproduction in specific environments. The unity among all living organisms is better demonstrated through their shared genetic code, structural similarities, and common ancestry.
Evolution by natural selection is currently the only viable theory explaining the diversity of life. However, the mechanism of natural selection is not the only mechanism to affect evolution. There are phenomena such as genetic drift, biased gene conversion, intragenomic conflict, and so on, that aren't exactly the same as natural selection (although they are all intertwined and all affect one another), but do affect the direction of evolution.