Darwin observed that members of a population vary in their functional, physical, and behavioral characteristics. there is a constant struggle for survival of organisms. organisms in a normal population differ in reproductive success. All of the choices are correct. None of the choices are correct.

All of the choices are correct

Explanation:

Darwin observed that members of a population produced more offsprings which competed for depleting resources among themselves. Genetic varieties among organisms caused some organisms to be better adapted to survive as compared to other organisms in a population. These organisms were favoured by natural selection and they were able to reproduce and pass on their characteristics to their offsprings.  The organisms with better characteristics has more reproductive success as compared to other organisms of the species.

small, big, or no change could occur in the phenotype. it could cause something as simple as a cats ears to curl backwards or something as frighting as death. it could also occur in the protien-coding area and have an effect on that but no effect on the amino acids. what has to occur is a changing in the hox gene or the control gene.