D identical. thats what replication is. making exact copies
Pretty sure the answer is B. Hunting, as this will dwindle the population of elk.
Answer
Some organisms observed by Charlis Darwin are as follow:
1. Beetles
2. Giant tortoise
3. Mockingbird
4. Rhea
5. Pigeon
6. Sand lady slipper
That would be the concentration gradient of hydrogen ions(protons). See the attached pic:)