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Rat Island Crossword

Across
Internal systematic responses to external stimuli in order to help an organism maintain homeostasis.
Gradual change in a species through adaptations over time.
Idea that those organisms best adapted to a given environment will be most likely to survive to reproductive age and have offspring of their own.
Physical features of an organism like the bill on a bird or the fur on a bear.
Down
Alteration of allele frequencies in a population by chance events, results in disruption of genetic equilibrium
Structural adaption that enables species to blend with their surroundings.
Process of breeding organisms with specific traits in order to produce offspring with identical traits.
Evolution of a structure, behavior, or internal process that enables an organism to respond to environmental factors and live to reproduce offspring.
Mechanism for change in populations occurs when organisms with favorable variations survive, reproduce and pass their variations to the next generation.
Structures with common evolutionary origins can be similar in arrangement, in function, or both, provides evidence of evolution from a common ancestor, fore limbs or crocodiles, whales and birds are some examples.
A structure in a present day organism that no longer serves its natural purpose but was probably useful to an ancestor, provides evidence of evolution.
Structural adaptation that enables one species to resemble another species may provide protection from predators or other advantages.
Instinctive seasonal movements of animals from place to place.
Structures that do not have a common evolutionary origin but are similar in function
Any change or random error in a DNA sequence.
The condition of being physically fit and healthy.