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:
Humans disturb the earth and because of this, the earth is weakened.
Mees lines. These are characteristic of heavy metal poisoning.