The area of a bookshelf is 216 square inches. if the length of the bookshelf is 36
inches, What is the width of the bookshelf?

What is the difference between an igneous, sedimentary and metamorphic rock

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?

Which of these statements is true about autotrophs, but not heterotrophs? a. they use sugar and oxygen to make carbon dioxide and water. b. they use chlorophyll and oxygen to make carbon dioxide and water. c. they use sunlight, water, and carbon dioxide to make sugars. d. they use sunlight, water, and oxygen to make chlorophyll.