Evolution and Biological Adaptation

Darwinian fitness specifically measures an organism's reproductive success - how many viable offspring it produces that contribute genes to the next generation's gene pool. Health and environmental stability are factors that might influence fitness, but not the measure itself. Genetic recombination is a mechanism, not a fitness metric.

Metamorphosis describes a dramatic change in form or structure. The word refers to a striking transformation, often used in biology (like caterpillar to butterfly) or to describe radical structural changes. Revolution typically means overthrow of a government, evolution is gradual change, and transformation is similar but metamorphosis specifically connotes a sudden, striking change in structure or form.

Metamorphosis describes a sudden striking change in structure or form, like a caterpillar becoming a butterfly. Revolution means political overthrow, evolution is gradual change, and transformation is general change - metamorphosis specifically implies dramatic structural change.

Phylogeny is the correct spelling for the evolutionary history and relationships of a species or group. The biological term uses 'ph' not 'f', maintains the 'y' after 'ph', and ends in '-geny' from Greek 'genesis' meaning origin. Options A, C, and D all misspell with incorrect consonant or vowel combinations.

'The Descent of Man' is Charles Darwin's 1871 work applying evolutionary theory to human evolution and sexual selection. It expanded on ideas briefly mentioned in 'Origin of Species' and sparked significant debate about human origins. The other listed authors did not write this scientific treatise.

Dolphins and sharks both evolved streamlined bodies and fins for efficient swimming despite being mammals and fish respectively. Convergent evolution occurs when unrelated species develop similar traits due to similar environmental pressures, not because of shared ancestry. Other pairs listed share recent common ancestors.

Evolutionary sequence shows increasing complexity: sharks (cartilaginous fish, earliest vertebrates) → tortoises (reptiles, evolved from amphibians) → otters (mammals, most recent). Option B correctly reflects this progression. Sharks are ancient fish (~400 million years), tortoises are reptiles (~230 million years), and otters are mammals (~50 million years).

The tagline 'Evolution begins' was used for X-Men (2000), the first film in the franchise. It references both the biological evolution of mutants (Homo superior) and the cinematic evolution of superhero films, marking a new era of more serious, character-driven comic book movies.

Many shrimp species are protogynous hermaphrodites, meaning they start life as males and later transform into females. This reproductive strategy is common in many aquatic species including some shrimp, clownfish, and wrasses.

The rate of evolutionary change for skin colour is much slower than the homogenizing effect of human migrations today. This process of interregional movements of societies has been accelerating, particularly since the time of Columbus.

Correct; removes the Error of Misplaced Modifier and correctly refers to 'Life' when referring to 'basic structure'; removes the redundant 'When'.

Correct; the sentence is pithy, removes redundancy, and uses 'only' as it should be. The use of the word 'survivors' instead of 'ultimate survivors' cuts down on over-stressing which GMAT frowns upon. Also, the use of 'only' suggests that the survivors survive just because they adapted faster. Additionally, the use of 'faster' correctly suggests that though other species/ members of their species might have adapted, the survivors managed to do so because they adapted faster.

Convergent evolution occurs in unrelated lineages. So, analogous structures are traits arising from this kind of evolution.