<span>Touching a hot pan and yanking your hand away: Pain and reflexes
Jumping up and down: Equilibrium and depth perception.
Drinking water on a hot day: Dehydration and lowering your temperature.
Sneezing: reaction to dust, smut, grains, or allergies.
Blushing: The rising of your blood temperature and nervousness.
Hitting your head on the top of the car as you get into it: Pain and depth perception.
Breathing harder during a jog: increased heart rate, blood flow, and less oxygen. </span>
Explanation:
Cnidarians contain specialized cells known as cnidocytes (“stinging cells”) containing organelles called nematocysts (stingers).
Answer and Explanation:
Nutritive gelatine was the first agent used to solidify a culture. With time, gelatin was replaced by agar, which has proven to be much better on many occasions. Gelatine has an animal origin (cartilage), while agar has a vegetable origin (algae).
The disadvantage of using gelatin is that it needs an incubation temperature of 20ºC or less to solidify. Many times this temperature is inferior to the optimal temperature needed by bacterias to grow. The optimal temperature of many Micrococcus species is about 25 and 30ºC. At these temperatures, gelatin would probably melt.
Another important aspect is that many organisms might consume the gelatine, metabolizing it. In nature, Micrococcus species might be found growing in products of animal origin.