Why do boys have a more complicated reproductive system them girls?

Which one of the following statements about muscle is  mostaccurate?   a.  it weighs the same as fat.    b.  its weight in relation to fat depends on a person's fitness level.    c.  it weighs less than fat.    d.  it weighs more than fat

Causation can be proved by using an

Which of these should be re portable health diseases to protect public health? a- obesity b- measles c- diabetes d-lung cancer