Heart disease is linked most closely with

Which statement is true about the cell theory? a) it is well-supported by evidence. b) it is unchangeable and permanent.

The seed coat's most important function is to provide a) a nonstressful environment for the megasporangium. b) the means for dispersal. c) dormancy. d) a nutrient supply for the embryo. e) desiccation resistance.

What is usually (but not always) related to the metabolic processes of living organisms in its organic form?