B.Sometimes true,As you sometimes to need to learn on the alternative provided in getting a solution that is factual
two strands of DNA are held together by weak hydrogen bonds.
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: