Rosalind Franklin was a British biophysicist and X-ray crystallographer who made significant contributions to the understanding of the molecular structures of DNA, RNA, viruses, coal, and graphite. She is best known for her work on the X-ray diffraction images of DNA, which played a crucial role in the discovery of the double helix structure of DNA by James Watson and Francis Crick. Despite her groundbreaking work, Franklin did not receive the recognition she deserved during her lifetime, and her contributions were often overshadowed by her male colleagues. Franklin's work has since been acknowledged and she is now celebrated for her important contributions to the field of molecular biology. **

Small electric two-wheeler three-wheeler flatbeds with a roof typically have a compact design with a flatbed at the rear for carrying goods. They are usually equipped with a roof to provide protection from the elements. The vehicles are designed to be lightweight and maneuverable, making them suitable for navigating through crowded urban areas. They often have a simple and functional appearance, with a focus on practicality and efficiency for transporting goods in a small-scale urban environment. **

A two-wheeler mechanic master is a highly skilled and experienced professional who specializes in repairing and maintaining motorcycles, scooters, and other two-wheeled vehicles. They have extensive knowledge of the mechanical and electrical systems of two-wheelers and are capable of diagnosing and fixing a wide range of issues. These experts are often sought after for their ability to provide efficient and effective solutions to keep two-wheelers in top condition. **

In general, a car is considered safer than a two-wheeler due to its enclosed structure, seat belts, airbags, and other safety features. Cars provide more protection in the event of a crash and are less susceptible to external factors such as weather conditions and road hazards. However, safe driving practices and adherence to traffic laws are crucial for both car and two-wheeler users to minimize the risk of accidents and injuries. **

A rectangle is a four-sided polygon with opposite sides that are equal in length and parallel to each other. It has four right angles, meaning each angle measures 90 degrees. The length of the longer sides is called the length of the rectangle, while the length of the shorter sides is called the width. The area of a rectangle is calculated by multiplying its length by its width, and the perimeter is found by adding together the lengths of all four sides. **

Yes, this is a rectangle. A rectangle is a four-sided shape with opposite sides that are equal in length and all angles are right angles (90 degrees). The shape in question has four sides with opposite sides being equal in length and all angles measuring 90 degrees, meeting the criteria for a rectangle. **

Yes, a square is a special type of rectangle. All squares are rectangles because they have four sides and four right angles, which are the defining characteristics of a rectangle. However, not all rectangles are squares. A square is a specific type of rectangle where all four sides are of equal length, while a rectangle can have different length sides. **

The engine of the Big Wheeler 510 may not start due to a variety of reasons such as a dead battery, a faulty ignition system, a lack of fuel reaching the engine, or a problem with the starter motor. It could also be caused by issues with the fuel system, such as a clogged fuel filter or a malfunctioning fuel pump. Additionally, problems with the spark plugs or a broken timing belt could also prevent the engine from starting. It is important to troubleshoot and diagnose the specific issue in order to determine the exact reason why the engine won't start. **