Biology Crossword

A supposition or a system of ideas intended to explain something
Explanation made on the basis of limited evidence
Principles by which everything in the Universe is governed
Theory in biology that includes one or both of the statements that the cell is the fundamental structural and functional unit of living matter
An organism whose cells contain a nucleus surrounded by a membrane
Any of the typically unicellular microorganisms that lack a distinct nucleus and membrane-bound organelles
The semipermeable membrane surrounding the cytoplasm of a cell
Any of a number of organized or specialized structures within a living cell
The remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock
(of organs) Similar in position, structure, and evolutionary origin but not necessarily in function
(of structures) Performing a similar function but having a different evolutionary origin, such as the wings of insects and birds
A branching diagram showing the cladistic relationship between a number of species
The branch of science concerned with classification, especially of organisms
The system of nomenclature in which two terms are used to denote a species of living organism
This cycle results in the destruction of the infected cell and its membrane
One of two cycles of viral reproduction (the lytic cycle being the other)
An infectious entity affecting plants, smaller than a virus and consisting only of nucleic acid without a protein coat
A protein particle that is believed to be the cause of brain diseases
The formation of new and distinct species in the course of evolution
A theory that the mitochondria of eukaryotes and the chloroplasts of green plants and flagellates originated as free-living prokaryotes that invaded primitive eukaryotic cells and become established as permanent symbionts in the cytoplasm
An interacting group of various species in a common location
A system that includes all living organisms (biotic factors) in an area as well as its physical environment (abiotic factors) functioning together as a unit
The development or evolution of a particular group of organisms
A large community of plants and animals that occupies a distinct region
The diversification of a group of organisms into forms filling different ecological niches