What are some rare types of clouds? how are they formed? explain your answer

The Kelvin Helmholtz Waves is one of the rarest clouds. along with the Lenticular Cloud, Fallstreak Hole, Roll Cloud, and Nacreous Cloud.

Explanation: The Kelvin Hemholtz occurs when two different layers of air in our atmosphere are moving at different speeds (a phenomenon known as shear). ... The most obvious example is wind blowing over water, in which fast-moving air can create the waves on the slower-moving water. The lengicular cloud is caused when the air is stable and winds blow across hills and mountains from the same or similar direction at different heights through the troposphere. The nacreous cloud is caused when  the temperature in the stratosphere is below a chilly -78°C, which turns any moisture in the air into super-cooled liquid or ice crystals. ... This light is refracted by the ice crystals in the clouds, a process known as cloud iridescence, producing the shimmering rainbow effect.

ans.

gregor john mendel is known for study of inheritance in pea plants. he used garden pea plant for his study, having alternative traits for various characters. he performed cross-breeding in pea plants to check how characters are transmitted between parents to offspring, such as cross between pure tall and pure dwarf plant. mendel studied the inheritance patterns in pea plants for various generations.

thus, the correct answer includes options and f).