How many sec chromosomes does a normal human somatic cell have?

Cells tend to have a relatively small and uniform size. why aren’t cells larger?

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 are some possible short and long term medical concerns for crew members on longer space exploration trips