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Evolution

Across
The ability to not be affected by something
A set of principles on which the practice of an activity is based
The point or place where something begins, arises or is derived
A plant or animal that is suited to be in water
A state in which opposing forces or influences are balanced
Organisms that contain membrane-bound organelles such as nuclei
A species no longer having any living members
A feature or quality of a species used to identify it
A unit of heredity that is passed down from parent to offspring
The production of offspring due to a sexual or asexual process
The evolutionary development and relationships among species
The forming of a theory without firm evidence
The remains or impressions of a prehistoric organism
An animal that naturally preys on others
A trait that is inherited from one generation to the next
A group of mammals that have grasping hands and feet with opposable first digits
Down
The evolution of a species by gradual accumulation of small genetic changes
A group of living organisms consisting of similar genes
The smallest fundamental unit of a chemical compound
Suggested explanation of observations
Differences among the same species
The body of facts or information indicating whether a belief or proposition is valid.
The variety of life in the world or in a particular ecosystem
A characteristic that improves an organism's ability to survive
The tendency of unrelated species to evolve similar characteristics under similar living conditions
Single-celled organisms that lack true nuclei and organelles
The action of imitating someone or something
A group of primates that have large brains, lack tails and have swinging arms.
A change that is a result of a consequence or action
An origin or background of a species