**Core Concept**
The Hardy-Weinberg law is a fundamental principle in population genetics that describes the conditions under which the frequency of alleles (different forms of a gene) in a population remains constant from one generation to the next. This equilibrium is achieved when certain factors such as mutation, genetic drift, gene flow, and natural selection are absent or balanced.

**Why the Correct Answer is Right**
The Hardy-Weinberg law specifically states that genetic equilibrium is maintained when there is no natural selection acting on the population. Natural selection is a process that favors the survival and reproduction of individuals with advantageous traits, leading to a change in allele frequencies over time. Therefore, it disrupts the equilibrium predicted by the Hardy-Weinberg law. The correct answer accurately describes the process of natural selection, which is a key factor that prevents the Hardy-Weinberg equilibrium from being achieved.

**Why Each Wrong Option is Incorrect**
**Option A:** This statement is correct and is actually a core concept of the Hardy-Weinberg law. It describes the conditions under which genetic equilibrium is maintained.
**Option B:** Hardy-Weinberg law actually assumes a population is in a state of equilibrium, not that the population is static. A static population would imply no gene flow, which is not a requirement for the law to hold.
**Option C:** This statement is correct and lists the factors that can influence the gene pool, including mutation, natural selection, population movements, and others. These factors can disrupt the equilibrium predicted by the Hardy-Weinberg law.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the Hardy-Weinberg law provides a useful framework for understanding genetic equilibrium, but it's not a realistic model for most natural populations. In reality, populations are constantly changing due to various genetic and environmental factors, making it challenging to achieve and maintain genetic equilibrium.

**✓ Correct Answer: D. Natural selection is a process where harmful genes are not eliminated from the gene pool and genes favorable to individual are not passed onto offspring.**

✓ Correct Answer: D. Natural selection is a process where harmful genes are not eliminated from the gene pool and genes favorable to individual are not passed onto offspring .