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.

Which of the following types of stars are dim but can have high surface temperatures? giants main sequence stars supergiants dwarfs

Match the correct terms to their descriptions a system in which only energy but not matter is exchanged frozen water in snow part of geosphere that includes only soil a thin layer between the troposphere and the stratosphere cryosphere tropopause closed system pedosphere

Which of the following is the function of the nociceptors? a. detecting odors in the nose b. detecting painful stimuli c. detecting central body temperature d. detecting touch and pressure