Question

Struggle for existence and survival of the fittest theories were proposed by
(a) Darwin
(b) Lamarck
(c) Wallace
(d) None of these

Answer 1

It is the process by which organisms change over time as a result of changes in heritable physical or behavioral traits. The changes can take place and it permits an organism to better adapt to its environment and will assist it to survive and have more offspring.

Complete answer:
The struggle for existence and survival of the fittest theories was proposed by Darwin. The quintessence of Darwinian theory about evolution is based on Natural selection. The concept says that nature selects fitness. This fitness is based on characteristics that are inherited.
Hence some organizations are better adapted to survive in an otherwise hostile environment. Adaptive ability is acquired and it is based on genetics. The two key ideas are Branching descent and Natural selection of the Darwinian Theory of Evolution.

Additional Information:
The three important elements of Darwin’s theory of evolution by natural selection are variation, reproduction, and heritability. Variations benefit an individual (or a species) in the physical features of organisms that tend to the struggle for existence are preserved and passed on (or selected) because the people (or species) that have them will in general endure.
So the correct answer is ‘Darwin’.

Note: A struggle for presence definitely follows from the high rate at which all-natural beings will in general increment. Each and every being, which during its natural lifetime creates a few eggs or seeds, must endure demolition during some period of its life, and during some season discontinuous year, regardless, on the rule of mathematical augmentation, its numbers would promptly turn out to be so excessively incredible that no nation could uphold the item.