Which of these characteristics is often used as a measure of an ecosystems health? A. The variety of species that lives there B. The number of people who live there C. The amount of population that occurs there D. The types of activities that can be done there

The earth consists of a variety of different organisms. despite their diversity, however, some similarities on the structural and metabolic levels may be seen. these similarities can be attributed to a. similarities among organisms in their proteins and nucleic acids. b. the ability of organisms to readily adapt to sudden environmental changes. c. similarities in organisms' habitats and niches. d. the ability of all organisms to interbreed and produce new species.

Environmental differences within ecosystems are generally caused by

Lucia is walking barefoot in her yard. she accidentally steps on a nail. how will her nervous system work to generate a reaction? arrange the eventschronologically.