A fifth-grader studying for a history test puts all of the Revolutionary War leaders from England on one index card to study and all of the American leaders on another card. This student is using the memory strategy known as ____________

The central portion of the retina is the ____________

A) fovea B) lens C) cornea D) cones

Which of the following species has demonstrated the ability to communicate meaningfully with each other and with humans by the use of gestures, sounds or symbols?

a) chimpanzees b) dolphins c) parrots d) all of the above