Acrystallographer measures the horizontal spacing between molecules in a crystal. the spacing is
13.9
nm
. what is the total width of a crystal in millimeters
105
molecules across? write your answer as a decimal.

Citric acid has a ph between 1 and 3.  it is considered to be aa. weak acidb. weak basec. strong based. strong acid

Which organism develops breathing organism develops breathing organs from pharyngeal arches? shark, spider, sea star, sea horse

In what way do investigations build scientific knowledge? the results of investigations lead to questions that cannot be tested. they reflect the opinions and social values of scientists, ensuring valid information. the results of investigations lead to new questions, which lead to new investigations. they are not influenced by the research of earlier scientists, so they are able to address gaps in understanding. i