The spinal cavity ,is enclosed within the vertebral foramen of the vertebrae
B. Hydrogen bonds make the positive sides of water molecules stick to each other
A homogeneous mixture is not considered a pure substance because it can be separated through mechanical and thermal processes. A pure substance, however, cannot be separated.<span>
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Answer:
deuterostomes
Explanation:
During the formation of the gastrula, a group of cells migrates towards the inside. The resultant sac forms the embryonic gut. The embryonic gut has an opening that opens to the outside and is called the blastopore. The blastopore may give rise to mouth or anus. In some organisms, blastopore develops into the anus. These organisms are called deuterostomes. The other organisms in which blastopore develops into the mouth are called protosomes. Echinoderms, hemichordates, and chordates are deuterostomes.
