A group of students were trying to understand how meiosis works. They picked a bunch of dandelions in order to examine the developing seeds and found two distinct groups of cells, A & B. A 2 column table with 4 rows. Column 1 is labeled Observation # with entries I, I I, I I I, I V. Column 2 is labeled Prediction with entries the cells in group B had chromosomes in 2 distinct lines; the cells in group A divided and produced 2 daughter cells; sister chromatids were pulled apart by microtubules in group A; chromosomes were made up of 2 sister chromatids in group b.

If the students wished to determine which cells are undergoing meiosis I or meiosis II, which observations would be useful to help with making the distinction?

I & II
I & III
II & IV
III & IV

An easy way to calculate the amount of energy available at each level is to what?

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.

Ecologist have observed a sharp increase of sulfur dioxide in the air . what might be a possible consequence of excessive sulfur dioxide in the air ? a. acid rain b. ozone layer depletion c.ozone layer hole d.increase in sea levels