Which one provides the correct sequence of events in origin...

Which one provides the correct sequence of events in origin of species according to Darwinism? (A) Natural selection (B) Variations and their inheritance (C) Survival of the fittest (D) Struggle for existence (a) $\mathrm{A}, \mathrm{B}, \mathrm{C}, \mathrm{D}$ (b) B, D, C, A (c) D, B, C, A (d) B, C, A, D

Which one provides the correct sequence of events in origin of species according to Darwinism?
(A) Natural selection
(B) Variations and their inheritance
(C) Survival of the fittest
(D) Struggle for existence
(a) $\mathrm{A}, \mathrm{B}, \mathrm{C}, \mathrm{D}$
(b) B, D, C, A
(c) D, B, C, A
(d) B, C, A, D

Key Concepts

Variation and Inheritance

This concept refers to the fact that within a population, individuals are not identical but exhibit differences in traits, many of which can be passed on to offspring. These heritable variations are the raw material upon which evolutionary processes act, providing the diversity that can be selectively favored in changing environments.

Struggle for Existence

This idea, central to Darwin's thinking, describes how organisms compete for limited resources such as food, space, and mates. The competition created by overpopulation and limited resources forces a struggle for survival, which is a prerequisite for the process of natural selection.

Survival of the Fittest

This term explains the outcome of the struggle for existence, where individuals with traits better suited to their environment tend to survive and reproduce more successfully than those with less advantageous traits. It encapsulates the idea that 'fitness' is measured by reproductive success in relation to the environment.

Natural Selection

Natural selection is the process by which certain heritable traits become more common in a population over successive generations because these traits improve an organism's chances to survive and reproduce. It is the mechanism by which evolutionary change occurs, leading to adaptations and the gradual emergence of new species.

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