Answer: We have it inside of our bodies
Explanation: Biology
To prevent blood flowing back after each heartbeat. They ensure that the blood flows only in one direction (back to the heart).
The answer for the above question is Mutation.
Mutations are random spontaneous changes that occur suddenly in the DNA. A single mutation can have a large effect, however in may cases evolutionary changes are based on the accumulation of many mutations. The gene flow is any movement of genes from one generation to another and is an important source of mutation
D. The center or eye of a hurricane is warmer than its surroundings. I'm pretty sure that's right or it's c!
You can use the volume displacement method. If you had the alligator in a tank and you knew how much the volume of water in the tank was before the alligator was in there you could subtract that from the volume of the water with the alligator in the tank.