When does crossing over occur in meiosis?

a. prophase i

b. metaphase i

c. metaphase ii

d. prophase ii

Mercury metal is poured into a graduated cylinder that holds exactly 22.5 ml the mercury used to fill the cylinder mass in 306.0 g from this information calculate the density of mercury

What is the next step in muscle contraction after the actin changes shape

The effect of a hormone on a target cell may be decreased by the presence of