Vertebrates have back bones or spines that give there body support.
Answer:
I don't know I'm sorry I will tell you another answer asks me
Answer:
If the type of food available changes, then the frequency of beak also changes.
Answer:
A. Making an observation
Explanation:
Before you can communicate findings, you first need to have findings. And before you can test a hypothesis, you first need to come up with a hypothesis, which can be done by first making an observation.