I don’t understand the question.
The evolution of different plant and animal species has been one of the most mysterious elements as far as the field of science is concerned. By definition, vestigial structures are those body parts in which their functions to the body have been "Phased-out" due to the evolution. It demonstrates common ancestry because "<span>remnants of organs or structures that had a function in an early ancestor."</span>
A grassland is a biome, an area of land that mostly has grasses. There are wild grasses, and there may be some trees. Several parts of the world have grasslands. Grasslands are found in Africa, North America, Central Asia, South America, and near the coasts of Australia.
Answer:
Air contains about 21 percent oxygen, and most fires require at least 16 percent oxygen content to burn. Oxygen supports the chemical processes that occur during fire. When fuel burns, it reacts with oxygen from the surrounding air, releasing heat and generating combustion products (gases, smoke, embers, etc.).
Explanation:
The basic structure of a cell membrane is formed by phospholipids, or the lipid bi-layer.