Because turtles do not breathe underwater. Their eggs cannot float in the water because they will be caught by predators. No one left. At least the baby turtles have a good speed and chance to get to safety, and their sheer numbers ensure some will fall into the nets of predators waiting to eat them. Eggs are completely defenseless. Adaptation is essential for the survival of living organisms. Animals that cannot adapt to changes in their environment will die. These adaptations are the result of genetic changes. The animals that survive will pass on the mutant genes to their offspring.
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This is called congenital selection. Adaptations such as camouflage and coloring protect them from predators. DNA mutations help animals survive longer in dangerous environments, and these traits for survival are passed on to future generations. These adaptations allow many types of organisms to thrive on planet earth. Charles Darwin studied turtles of two islands. Turtles found on this one island have short legs, straight shells, and food is native to the ground. A few turtles have migrated to another island where the food is much higher. The turtles with longer legs survived. Their necks elongate and the shells become plump over time. Consequently, the population on the new island has increased due to these adaptations in their species.