The answer is the spinal cord starts at the occipital
bone where it passes over the foramen
magnum, and encounters and go in the spinal
canal at the start of the cervical vertebrae. The spinal cord encompasses
down to amid the first and second lumbar
vertebrae where the spinal cord ends.
Changes in temperature, salt concentration, ionic concentration, of pH levels
Answer:
Among vertebrates, external fertilization is most common in amphibians and fish. Invertebrates utilizing external fertilization are mostly benthic, sessile, or both, including animals such as coral, sea anemones, and tube-dwelling polychaetes. Benthic marine plants also use external fertilization to reproduce.
= Fish
Explanation:
