Researchers have determined that the distribution of plant growth on Earth has been slowly shifting closer to the Arctic and Antarctic poles. Which change best explains why global growth patterns might be shifting?
an increase in deforestation by insects
a seasonal decrease in hours of sunlight
a seasonal decrease in rainfall near the equator
an increase in temperatures due to climate change

Which statement is true about the cell theory? a) it is well-supported by evidence. b) it is unchangeable and permanent.

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.

Which of the following particles always has a positive charge? a. electronb. neutron c. proton d. ion