Ten-year-old Bill is playing with his baby sister, Lucy. He takes Lucy's teddy bear and hides it behind a pillow while Lucy watches. Lucy quickly finds the bear. Then Bill puts the teddy bear in a bag, puts the bag behind a chair (where he dumps out the bear), and brings out the empty bag. Lucy looks inside the bag but never tries to look for the bear behind the chair. Which one of Piaget's sensory motor substages is Lucy in

The hypothesis of continental drift states that earth's continents, which are located on tectonic plates, move relative to each other. which of the following is true of the movement of the tectonic plates? a. tectonic plates only move once every million years. b. they move at a rate of approximately 5 centimeters per year. c. tectonic plates never move, only the continents located on them do. d. their movements are very rapid and occur at random times.

Which of the organisms listed below performs nitrogen fixation? a. legumes b. plants c. bacteria d. fungi

What are the pros and cons of quadrat sampling?