If a pin is 0.001 m wide, how many red blood cells could you line up across a pin?

Which zone within the open-ocean zone is home to the most organisms? deep zone surface zone intertidal zone transition zone

Modern sea star larvae resemble some primitive vertebrate larvae. this similarity may suggest that primitive vertebrates

Lupe is a carrier for color blindness. her husband clifford is colorblind. if lupe and clifford have four children, what's the probability of a boy being colorblind?