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What is 1 + 3?
green pigment in plants that absorbs light energy used to carry out photosynthesis
invertebrate (animal having no backbone) with jointed legs, e.g., insects
evergreen, cone-bearing tree
An individual living thing
a group of organisms of the same species populating a given area
All the different populations that live together in an area
living and nonliving things in an environment, together with their interactions
The part of Earth where life exists