The answer is b mass because that's how you will measure it
Answer:
notochord, a dorsal hollow nerve cord and pharyngeal slits.
Answer:
e) Invertebrates lack a nervous system
Explanation:
One of the main characteristics of invertebrates is that they don't have a backbone. Backbones belong to the skeletal system. A totally different story is the nervous system which runs inside the backbone. Although the more complex nervous systems appear in vertebrates the simply fact of having eyes like crabs or insects implies having a nervous system that can control them.
The answer to your question should be a and c hope this helps
