1.
Basic unit of structure and organization of all living organisms
2.
Consists of specialized cells that work together to perform a function
3.
Consists of different tissues that work together to perform a specific function
4.
Consists of multiple organs that work together to perform a function for living organisms
5.
Anything that has or once had all the characteristics of life
6.
Group of organisms of the same species that occupy the same geographic place at the same time
7.
Group of interacting populations that live in the same geographic area at the same time
8.
Biological community and all the nonliving factors that affect it
9.
Large group of ecosystems that share the same climate and have similar types of communities
10.
Relatively thin layer of Earth and its atmosphere that supports life
11.
Any living factor in an organism’s environment
12.
Any nonliving factor in an organism’s environment, such as soil, water temperature, and light availability
13.
Number of different species living in a specific area
14.
The variety of genes within a given species
15.
The number and relative abundance of species in a biological community.
16.
The variety of ecosystems within a given region
17.
A species that influences the survival of many other species in an ecosystem
18.
Nonnative species deliberately or accidentally introduced into a new habitat
19.
Species that normally live and thrive in a particular ecosystem
20.
Species that is found in only one area; such species are especially vulnerable to extinction
21.
Species that serve as early warnings that a community or ecosystem is being degraded
22.
A species whose numbers are so small that the species is at risk of extinction
23.
Attempts by two or more organisms of a single species to use the same limited resources in an ecosystem
24.
Attempts by members of two or more species to use the same limited resources in an ecosystem
25.
Type of species interaction in which both participating species generally benefit
26.
An interaction between organisms of different species in which one type of organism benefits and the other type is neither helped nor harmed
27.
Interaction between species in which one organism, called the parasite, preys on another organism, called the host by living on or in the host
