The tallest book in the Library of Congress is John James Audubon's "Birds of America", which is about 40 inches long. Its size is necessitated by the life-size drawings of birds.
A control is an additional experiment you run alongside your test experiment. It is identical in every way to your test experiment,
are their options? or are you just asking lol if you are just asking then my answer would be
Show them you care,be enthusiastic,be positive
Even without complete isolation, the infant monkeys raised without mothers developed social deficits, showing reclusive tendencies and clinging to their cloth diapers. ... Harlow's work showed that infants also turned to inanimate surrogate mothers for comfort when they were faced with new and scary situations.