On page 34 the text says "engineers need to think about the porosity of the materials they are planning to use." Why does pore size (the opening in a surface) matter when thinking about filters?

Alexander was adopted as an infant. he grew up to have high levels of extraversion and agreeableness. what factor most likely accounts for these personality traits? a. the values and beliefs of his adoptive parents b. his genetic make-up c. peer influence d. his early learning experiences