How can two parents have type a blood but there son have type o

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

What is the source of continuous heat and energy that we receive from the sun

Avogradoa number was calculated by determining the number of atoms in?