Answer:
Burrowing.
Explanation:
Tortoises can dig into the earth and build burrows with their sturdy paws and long legs, which shield them from predators as well as hot and cold temperature conditions.
The correct answer is (a.) a mutation of the hemoglobin allowing better oxygen-carrying capacity. The mutation of the hemoglobin that allows a better oxygen-carrying capacity would be the most beneficial to an elephant and its descendants.
Mitochondria, plastids and chloroplast all are surrounded by a double membrane
They don't need to be near water for reproductive purposes!
