How are ionic and covalent bonds relevant to the suitability of water as a medium for living systems?

There are six elements that make up most of the human body. which of the following is not one of these six elements?

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.

How dose plate tectonics effect climate