Identify the theme or themes exemplified by (a) the sharp spines of a porcupine, (b) the cloning of a plant form a single cell, and (c) a hummingbird using sugar to power its flight.

the index of refraction of the second medium is higher. i just took the test trust me !

bru what tyep of qus is dis

the atmospheric gas that forms a mild acid when dissolved in water is called carbon dioxide. the correct answer is a. 2.) chemical weathering would cause an inscription on a marble headstone to become harder and harder to read over time.