Cnidarians <span>are the lower Invertebrates that have a jelly-like layer between endoderm and ectoderm</span>
Sounds like ADD (<span>Attention-Deficit Disorder).</span>
Answer:
1. The need to stay afloat
2. The need to eat and avoid being eaten
Explanation:
When coming to building something, some materials are more vulnerable to water and can wear away easier. Some can keep the water in, so depending on the material, the water quality can be better sustained.
