Adenine, Thymine, Guanine, and Cytosine
They possess complimentary paring. Meaning the one will only bind another, and will not bind with and other one
Microevolution is the answer
The correct answer is: D. tragedy of the commons theory.
The tragedy of the commons theory explains situation in a system where resources are shared and suddenly the individual users start to act independently. Individual users (in this case world countries) start to act according to their own self-interest behave contrary to the common good of all other users (e.g. fishing companies) by depleting or spoiling that resource (fishes and other marine organisms) through their collective action.
Different structures of cells can exist within the same organism. Different structures of cells may be indicative of different organelles presents different structures mostly arise due to different functions of the cell, as how structure of cells always complement the function of cells hence it is most it is mostly likely the last option that the cells have different functions
D. All of the above are true.