Answer:
Most invertebrates (and higher animals) can be placed in one of two groups based on how they develop as embryos. The two groups are called protostomes and deuterostomes. ... It shows that echinoderms are more closely related to chordates than are the other invertebrate phyla. Explanation:
Multipolar neurons<span>. This is the </span>most common type of neuron<span>, with one axon and many dendrites.</span>
Answer:
the mass of the system must remain constant over time
Explanation:
In other words matters cannot be created or destroyed, the overall amount will remain the same
