Every november, tens of thousands of sally lightfoot crabs on christmas island leave their rain forest habitats at the same time
. they march across the island to the sea in huge groups, arriving just in time to mate at high tide. about a month later, tens of thousands of baby crabs march back across the island to the rain forest. based on this information, what type of fertilization would you expect to discover in this species?
The type of fertilization that one would expect to find in this specie is EXTERNAL FERTILIZATION. External fertilization is the type of fertilization in which the male sperm fertilize the female eggs out of the female's body. This type of fertilization usually occur in aquatic environment.
Synchronized release of gametes to ensure fertilization is characteristic feature of external fertilization. The given information suggests that the crabs exhibit external fertilization. All the crabs move towards sea at the same time to synchronize the release of gametes. External fertilization of these gametes and hatching of fertilized egg release baby crabs.
The mass of the water does not change. However, the volume
varies with temperatures. Water at 4 degrees centigrade
occupies the least amount of volume compared to other temperatures.
Therefore based on the calculation of D=M/V, then water at 4 degrees centigrade has the highest density.
