My qualitative observation that the flower on the right had larger petals proved to be a great piece of evidence for my research project.
Answer:
B
Explanation:
Nerve cells can carry signals and connect all parts of the body to the brain
The first known single-celled organisms appeared on Earth about 3.5 billion years ago, roughly a billion years after Earth formed. More complex forms of life took longer to evolve, with the first multicellular animals not appearing until about 600 million years ago.
