When do the sun’s rays strike latitude 23.5°s at an angle of 90 degrees? september 21 december 21 march 21 june 21

Which of the following best describes the purpose of technology?

Round seeds and yellow seed color are dominant to wrinkled seeds and green seed color. which punnett square represents the correct way to set up the cross rryy  ´  rryy? 

Which set of terms best describes a community of miners who live out in the countryside of west virginia and use specialized geographical equipment to analyze the composition of rocks