They developed to be protected by the hard shell from parasites and ther predators.
Answer:
1. seawalls
2. volcanic
3. mass wasting
4. ocean basin
5. erosion
Explanation:
6. Reefs form from volcanic activity on an island in the ocean. This initially forms a fringing reef, but sea level rise can cause the reef to lie farther out from the island, forming a barrier reef. If the island ever subsides below sea level, the reef is called an atoll.
The probability of a crossover occurring between two particular genes on the same chromosome increases as the distance between those
The answer is Na + is entering the cell and the K + is leaving, during the depolarization phase of the action potential open Na + channels allow Na + ions to diffuse into the cell. This inward movement of positive charge makes the membrane potential more positive. The depolarization phase is a positive response sequence where open Na + channels cause depolarization which in re-occurrence causes more voltage gated Na+ channels to open.
