I need the picture in order to help you. Let me know if you need help adding the picture to the question.
My best guess would be c because b makes no since we as humans do not have photosynthesis and are considered living organisims, d is also wrong because the brain requires oxygen, and its not a because the brain is made of cells.
Vertebrates have back bones or spines that give there body support.
A) The data to support his hypothesis, so he should investigate if the same change happens in the density of solid water.
