Which of the following situations best represents a homeostatic mechanism? a) a person who becomes very nervous begins to sweat profusely. b) after going outside on a hot day, the core body temperature increases. c) increasing the size of fast food restaurant portions causes body weight to increase. d) after eating a large batch of salty popcorn, levels of salt in the urine increase. e) as age increases, the amount of calcium in the bones tends to decrease

Which is an example of a decomposer? a. bear b.algae c.grass d.bacteria d bacteria

If bacteria are much too small to see, what is one reason why can we see colonies in the petri dishes that have plenty of food to eat after only a few days?

Consider the motion of the balloon and its air contents in terms of momentum. in step 1 above, the total momentum of the balloon and its contents was zero. recall that momentum = mv. both the balloon and the air inside it had a velocity of zero and therefore the total momentum was zero. now think about what happened when the air escaped from the balloon. a certain mass of air accelerated in one direction. in order to keep the total momentum of the system zero, the balloon itself (which has mass) had to accelerate in the opposite direction. use this scenario to you explain why the soda can rotates when the water squirts out of the escape holes. what was your hypothesis concerning the water-filled can? according to your data, do you think your hypothesis was correct? (be sure to refer to your data when answering this question.) summarize any difficulties or problems you had in performing the experiment that might have affected the results. describe how you might change the procedure to avoid these problems. give at least one more example of newton's third law in everyday life.