How did the sea urchin population change over time in areas with sea otters 3 pieces of evidence and a reasoning

Would really appreciate it, i have an idea but not completely sure

Which of the following is an example of competition a. the leaves of a tree prevent a small shrub from getting sunlight. three species of birds feed a different heights in the same tree. b. three species of birds feed at different heights in the same tree c. zebra and giraffe’s feed on different grassland plants d. cats living in two different homes eat the same brand of cat food.

The wind speed in the region between cities a and b was probably the greatest at noon on which day?