Use what you know about natural selection to fill in the blanks in the hypothesis. it should answer the lab question, “what is the effect of the type of food available on the frequency of different types of bird beaks? ” hypothesis: if the type of food available changes, then…

 The blank in the question can be filled as-

If the type of food available changes, then over the passage of time, evolution of different beak types will result  that reflects adaptation according to the changing food habits because their body wants to adapt in order to survive and reproduce ( pass their genes to the next generation) under the changing conditions.

Therefore, the frequency of allele corresponding to beak will be enhanced or increased.

the reason the two sea urchins don't compete with each other for food, resources, etc. is because the urchins have adapted to the environment but they have also adapted to each other. this is most likely because the genes of the sea urchins.