Carbon atoms are the foundation of many of life's building blocks. carbon is able to form a wide variety of different compounds because it ? ? pls ! i think it's 2 1) can bond with hydrogen, oxygen, nitrogen, or sulfur. 2) can form bonds in up to four different directions. 3) is the central atom in carbon dioxide, a molecule used by all organisms. 4) can participate in ionic, covalent, and hydrogen bonds.

what statement best describes the difference between the sympathetic and parasympathetic nervous systems?

the sympathetic nervous system prepares the body for intense physical activity and is often referred to as the fight-or-flight response. the parasympathetic nervous system has almost the exact opposite effect and relaxes the body and inhibits or slows many high energy functions.

stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms