True or false? in most cases, chronic diseases have a single cause, making it easier for scientists to recognize significant risk factors and establish preventive measures.

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.

What is the next step in muscle contraction after the actin changes shape? (apex)

Study the diagram of a cell. which structure is found only in plant cells and functions in the process of photosynthesis? w x y z