Answer: I would go with B. Here’s why: An index fossil is usually easily recognizable, and underwent a wide geographic distribution. What leads me to believe B is the correct answer, is because it’s something that existed “ all over the world”.
Clouds appear white because of scattering. The droplets in the clouds are huge compared to the wave length of light, so all wavelengths scatter at the same time. Hope this helps! :)
Its D, Screen the work area with wielding shields
The answer is primary lesions. There are two types of lesions; primary and secondary. Primary lesions can be acquired from birth (birthmark) or over time probably from injury. Examples of primary lesions are macules, plaque, and papule. Secondary lesions are modifications of primary lesions. They include fissures, scales, and crust.