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#biology definition

2 public questions tagged with this topic.

NATURAL SELECTION

Fitness of an organism refers to

Reproductive success reflects key principle in quiz on natural selection, where evolutionary mechanisms shape genetic variation and adaptation. In this context, Reproductive success aligns with experimental and theoretical evidence from population genetics, behavioral ecology and molecular phylogeny. Textbooks like Campbell Biology, Futuyma Evolution and Hartl Principles illustrate supporting data. Understanding why Reproductive success fits helps integrate natural selection, environment.

Ref: Futuyma, Evolution, 4th ed., Chapter 11: Natural Selection.

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Animal Classification

Animals are best described as

Animals are best defined as multicellular eukaryotic heterotrophs whose cells lack rigid cell walls, exhibiting internal digestion within gastrovascular cavity or gut lumen, active motility and complex development from zygote through holoblastic cleavage forming morula, blastula and gastrula with germ layers. Diploid dominance, collagenous extracellular matrix, excitable neurons and muscle effectors characterize clade. Contrasts with unicellular autotrophs like Euglena, colonial photosynthetic Volvox and prokaryotic organisms lacking true nucleus, membrane organelles and linear chromosome orga

Ref: NCERT Class 11 Biology Chapter 4 Animal Kingdom General Characters; Campbell Biology 12th ed. Chapter 32 Definition of Animals

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