Which group of animals evolved from lobefin fishes?
Amphibians evolved from lobefin fishes, which had strong fins that allowed them to move on land.
Ref: NCERT Class 12 Biology Chapter 6: Evolution Origin of Life - Theories Miller Urey Experiment
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Sexual selection acts on:
Sexual selection, proposed by Darwin in 1871, favors traits increasing mating success rather than survival, via intrasexual competition among same sex and intersexual choice where choosier sex, often females investing more in gametes, selects mates. It explains elaborate ornaments, good genes indicators like MHC diversity and parasite resistance per Hamilton-Zuk hypothesis. Fisherian runaway and handicap principles describe coevolution of preference and trait. Therefore mating success traits describes process enhancing reproductive rather than viability fitness. This concept integrates genetic
Ref: Alcock, Animal Behavior, Kin Selection and Social Behavior.
Closest living relatives of animals are
Choanoflagellates unicellular and colonial flagellated protists occupy sister lineage to Metazoa within opisthokont supergroup, diverging most recently compared to green algae belonging to Archaeplastida, amoebae within Amoebozoa or ciliates within SAR. Ultrastructural and genomic evidence includes homologous collar of microvilli surrounding flagellum, receptor tyrosine kinases, cadherin repeats, Myc oncogenes and mitochondrial gene synteny. Genera Monosiga, Salpingoeca and colonial Proterospongia demonstrate rosette formation resembling sponge morula. Therefore phylogeny positions choanoflage
Ref: Campbell Biology 12th ed. Chapter 28 Protists Close to Animals; Nature Scientific Reports Choanoflagellates sister to Metazoa
A prominent evolutionary feature seen in higher forms of Kingdom Animalia is the development of a complex:
As animals evolved to actively search for food, avoid predators, and find mates, they required advanced bodily coordination. The NCERT textbook notes that higher forms of Kingdom Animalia show extraordinary elaboration and development of complex 'sensory and neuromotor mechanisms'. This encompasses everything from simple nerve nets in lower animals to the highly advanced brain and sensory organs found in vertebrates.
Ref: NCERT Class 11 Biology > Chapter 2: Biological Classification > 2.5 Kingdom Animalia