Examlex
Based on the observed red shifts in the spectral lines of distant galaxies,astronomers conclude that ________.
Ultimate Level
In biology, it refers to the fundamental reasons for traits or behaviors from an evolutionary perspective, often involving fitness and survival.
Evolve
To evolve is for a species to undergo gradual changes in its genetic makeup over generations, leading to adaptation and variation within the population.
Cerebral Cortex
The outer layer of the brain in vertebrates, responsible for complex brain functions such as thought, memory, emotion, and motor control.
Tetrapods
The superclass of animals with four limbs, including amphibians, reptiles, birds, and mammals, as well as their extinct relatives.
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