Why do some species employ both mitosis and meiosis, whereas other species use only mitosis?

Idont understand by supporting the plant and holding the leaves up to the light. question 3 options: tap or fibrous root flower petals herbaceous or wood stems leaves with stomata

Some tools have graduations to show multiple measurements. for example, a ruler may have graduations for both millimeters and centimeters. when measuring the length of an earthworm, which graduations would allow for the most accurate measurement? millimeters centimeters decimeters meters

Describe the relationship and movement between temperature and density in a convection cell. make sure you identify the direction of travel