<span>Presence of oxygen means that the organisms are not anaerobic so the answer is D. algae. Eukaryotic and prokaryotic cells can be anaerobic meaning that they live in circumstances where there's no oxygen. Algae were the first that required oxygen to thrive. Cyanobacteria are like other bacteria parts of the prokaryotic cell type.</span>
The atom has 17 protons, 20 neutrons, and 17 electrons.
The answer is C. Because they do have scales
The correct option is D.
For economically more developed countries, the age structure diagram is usually very evenly distributed. The economically less developed countries are the ones who usually have age structure diagram which resemble a pyramid. MDC are usually highly industrialized and economically rich.<span />
