How does the number of valence electrons in a metal affect its ractivity.

1) these are barrel shaped microtubules in most animal cells, that organize the spindles during cell division

Although respiratory organs vary across different organisms, they all contain respiratory surfaces that have a large surface area and are extremely thin. explain why having an extremely thin respiratory surface with a large surface area is advantageous for the process of gas exchange

Ahypothesis must be testable and falsifiable to be considered scientific a. trueb. false