How can you (and scientists) tell that a model is good? What kinds of tests can you run to assess the validity of a climate change model?

How did the research presented in the article affect scientists' understanding of the evolution of eukaryotes

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.

Acommon kind of mechanical weathering is called